diff --git a/generator/postgres-metadata/column_info.go b/generator/postgres-metadata/column_info.go
index 97e950f..d23a745 100644
--- a/generator/postgres-metadata/column_info.go
+++ b/generator/postgres-metadata/column_info.go
@@ -17,27 +17,27 @@ type ColumnInfo struct {
 func (c ColumnInfo) SqlBuilderColumnType() string {
 	switch c.DataType {
 	case "boolean":
-		return "BoolColumn"
+		return "Bool"
 	case "smallint", "integer", "bigint":
-		return "IntegerColumn"
+		return "Integer"
 	case "date":
-		return "DateColumn"
+		return "Date"
 	case "timestamp without time zone":
-		return "TimestampColumn"
+		return "Timestamp"
 	case "timestamp with time zone":
-		return "TimestampzColumn"
+		return "Timestampz"
 	case "time without time zone":
-		return "TimeColumn"
+		return "Time"
 	case "time with time zone":
-		return "TimezColumn"
+		return "Timez"
 	case "USER-DEFINED", "text", "character", "character varying", "bytea", "uuid",
 		"tsvector", "bit", "bit varying", "money", "json", "jsonb", "xml", "point", "interval", "line", "ARRAY":
-		return "StringColumn"
+		return "String"
 	case "real", "numeric", "decimal", "double precision":
-		return "FloatColumn"
+		return "Float"
 	default:
 		fmt.Println("Unknown sql type: " + c.DataType + ", using string column instead for sql builder.")
-		return "StringColumn"
+		return "String"
 	}
 }
 
diff --git a/generator/templates.go b/generator/templates.go
index ca15139..8b181be 100644
--- a/generator/templates.go
+++ b/generator/templates.go
@@ -31,7 +31,7 @@ type {{.GoStructName}} struct {
 	
 	//Columns
 {{- range .Columns}}
-	{{camelize .Name}} *sqlbuilder.{{.SqlBuilderColumnType}}
+	{{camelize .Name}} sqlbuilder.Column{{.SqlBuilderColumnType}}
 {{- end}}
 
 	AllColumns sqlbuilder.ColumnList
@@ -42,7 +42,7 @@ var {{camelize .Name}} = new{{.GoStructName}}()
 func new{{.GoStructName}}() *{{.GoStructName}} {
 	var (
 	{{- range .Columns}}
-		{{camelize .Name}}Column = sqlbuilder.New{{.SqlBuilderColumnType}}("{{.Name}}", {{.IsNullable}})
+		{{camelize .Name}}Column = sqlbuilder.{{.SqlBuilderColumnType}}Column("{{.Name}}")
 	{{- end}}
 	)
 
diff --git a/sqlbuilder/column.go b/sqlbuilder/column.go
index 642f8cd..bd5b14a 100644
--- a/sqlbuilder/column.go
+++ b/sqlbuilder/column.go
@@ -6,32 +6,34 @@ import (
 	"strings"
 )
 
-type Column interface {
-	Expression
-
+type column interface {
 	Name() string
 	TableName() string
-	IsNullable() bool
-	DefaultAlias() projection
+
 	// Internal function for tracking tableName that a column belongs to
 	// for the purpose of serialization
 	setTableName(table string)
+	defaultAlias() string
+	defaultAliasProjection() projection
+}
+
+type Column interface {
+	Expression
+	column
 }
 
 // The base type for real materialized columns.
-type baseColumn struct {
+type columnImpl struct {
 	expressionInterfaceImpl
 
-	name       string
-	isNullable bool
-	tableName  string
+	name      string
+	tableName string
 }
 
-func newBaseColumn(name string, isNullable bool, tableName string, parent Column) baseColumn {
-	bc := baseColumn{
-		name:       name,
-		isNullable: isNullable,
-		tableName:  tableName,
+func newColumn(name string, tableName string, parent Column) columnImpl {
+	bc := columnImpl{
+		name:      name,
+		tableName: tableName,
 	}
 
 	bc.expressionInterfaceImpl.parent = parent
@@ -39,27 +41,31 @@ func newBaseColumn(name string, isNullable bool, tableName string, parent Column
 	return bc
 }
 
-func (c *baseColumn) Name() string {
+func (c *columnImpl) Name() string {
 	return c.name
 }
 
-func (c *baseColumn) TableName() string {
+func (c *columnImpl) TableName() string {
 	return c.tableName
 }
 
-func (c *baseColumn) setTableName(table string) {
+func (c *columnImpl) setTableName(table string) {
 	c.tableName = table
 }
 
-func (c *baseColumn) IsNullable() bool {
-	return c.isNullable
+func (c *columnImpl) defaultAlias() string {
+	if c.tableName != "" {
+		return c.tableName + "." + c.name
+	}
+
+	return c.name
 }
 
-func (c *baseColumn) DefaultAlias() projection {
-	return c.AS(c.tableName + "." + c.name)
+func (c *columnImpl) defaultAliasProjection() projection {
+	return c.AS(c.defaultAlias())
 }
 
-func (c *baseColumn) serializeAsOrderBy(statement statementType, out *queryData) error {
+func (c *columnImpl) serializeAsOrderBy(statement statementType, out *queryData) error {
 	if statement == set_statement {
 		// set Statement (UNION, EXCEPT ...) can reference only select projections in order by clause
 		columnRef := ""
@@ -78,7 +84,7 @@ func (c *baseColumn) serializeAsOrderBy(statement statementType, out *queryData)
 	return c.serialize(statement, out)
 }
 
-func (c baseColumn) serialize(statement statementType, out *queryData, options ...serializeOption) error {
+func (c columnImpl) serialize(statement statementType, out *queryData, options ...serializeOption) error {
 
 	columnRef := ""
 
diff --git a/sqlbuilder/column_test.go b/sqlbuilder/column_test.go
index f3bb2eb..971919d 100644
--- a/sqlbuilder/column_test.go
+++ b/sqlbuilder/column_test.go
@@ -1,210 +1,14 @@
-// +build disabled
-
 package sqlbuilder
 
-import (
-	"bytes"
-	"testing"
+import "testing"
 
-	gc "gopkg.in/check.v1"
-)
+func TestColumn(t *testing.T) {
+	column := newColumn("col", "", nil)
+	column.expressionInterfaceImpl.parent = &column
 
-func Test(t *testing.T) {
-	gc.TestingT(t)
-}
-
-type ColumnSuite struct {
-}
-
-var _ = gc.Suite(&ColumnSuite{})
-
-//
-// tests for baseColumn and columns that extends baseColumn
-//
-
-func (s *ColumnSuite) TestRealColumnName(c *gc.C) {
-	col := IntColumn("col", Nullable)
-
-	c.Assert(col.Name(), gc.Equals, "col")
-}
-
-func (s *ColumnSuite) TestRealColumnSerializeSqlForColumnList(c *gc.C) {
-	col := IntColumn("col", Nullable)
-
-	// Without tableName name
-	buf := &bytes.Buffer{}
-
-	err := col.SerializeSqlForColumnList(buf)
-	c.Assert(err, gc.IsNil)
-
-	sql := buf.String()
-	c.Assert(sql, gc.Equals, "col")
-
-	// With tableName name
-	err = col.setTableName("foo")
-	c.Assert(err, gc.IsNil)
-
-	buf = &bytes.Buffer{}
-
-	err = col.SerializeSqlForColumnList(buf)
-	c.Assert(err, gc.IsNil)
-
-	sql = buf.String()
-	c.Assert(sql, gc.Equals, "foo.col")
-}
-
-func (s *ColumnSuite) TestRealColumnSerializeSql(c *gc.C) {
-	col := IntColumn("col", Nullable)
-
-	// Without tableName name
-	buf := &bytes.Buffer{}
-
-	err := col.SerializeSql(buf)
-	c.Assert(err, gc.IsNil)
-
-	sql := buf.String()
-	c.Assert(sql, gc.Equals, "col")
-
-	// With tableName name
-	err = col.setTableName("foo")
-	c.Assert(err, gc.IsNil)
-
-	buf = &bytes.Buffer{}
-
-	err = col.SerializeSql(buf)
-	c.Assert(err, gc.IsNil)
-
-	sql = buf.String()
-	c.Assert(sql, gc.Equals, "foo.col")
-}
-
-//
-// tests for AliasCoulmns
-//
-
-func (s *ColumnSuite) TestAliasColumnName(c *gc.C) {
-	col := Alias("foo", SqlFunc("max", table1Col1))
-
-	c.Assert(col.Name(), gc.Equals, "foo")
-}
-
-func (s *ColumnSuite) TestAliasColumnSerializeSqlForColumnList(c *gc.C) {
-	col := Alias("foo", SqlFunc("max", table1Col1))
-
-	buf := &bytes.Buffer{}
-	err := col.SerializeSqlForColumnList(buf)
-	c.Assert(err, gc.IsNil)
-
-	sql := buf.String()
-	c.Assert(err, gc.IsNil)
-
-	c.Assert(sql, gc.Equals, "(max(table1.col1)) AS \"foo\"")
-}
-
-func (s *ColumnSuite) TestAliasColumnSerializeSqlForColumnListNilExpr(c *gc.C) {
-	col := Alias("foo", nil)
-
-	buf := &bytes.Buffer{}
-	err := col.SerializeSqlForColumnList(buf)
-	c.Assert(err, gc.NotNil)
-}
-
-func (s *ColumnSuite) TestAliasColumnSerializeSqlForColumnListInvalidAlias(
-	c *gc.C) {
-
-	col := Alias("1234", SqlFunc("max", table1Col1))
-
-	buf := &bytes.Buffer{}
-	err := col.SerializeSqlForColumnList(buf)
-	c.Assert(err, gc.NotNil)
-}
-
-func (s *ColumnSuite) TestAliasColumnSerializeSql(c *gc.C) {
-	col := Alias("foo", SqlFunc("max", table1Col1))
-
-	buf := &bytes.Buffer{}
-	err := col.SerializeSql(buf)
-	c.Assert(err, gc.IsNil)
-
-	sql := buf.String()
-	c.Assert(sql, gc.Equals, "`foo`")
-}
-
-func (s *ColumnSuite) TestAliasColumnSetTableName(c *gc.C) {
-	col := Alias("foo", SqlFunc("max", table1Col1))
-
-	// should always error
-	err := col.setTableName("test")
-	c.Assert(err, gc.NotNil)
-}
-
-//
-// tests for deferredLookkupColumnName
-//
-
-func (s *ColumnSuite) TestDeferredLookupColumnName(c *gc.C) {
-	col := table1.C("foo")
-
-	c.Assert(col.Name(), gc.Equals, "foo")
-}
-
-func (s *ColumnSuite) TestDeferredLookupColumnSerializeSqlForColumnList(
-	c *gc.C) {
-
-	col := table1.C("col1")
-
-	buf := &bytes.Buffer{}
-
-	err := col.SerializeSql(buf)
-	c.Assert(err, gc.IsNil)
-
-	sql := buf.String()
-	c.Assert(sql, gc.Equals, "table1.col1")
-
-	// check cached lookup
-	buf = &bytes.Buffer{}
-
-	err = col.SerializeSql(buf)
-	c.Assert(err, gc.IsNil)
-
-	sql = buf.String()
-	c.Assert(sql, gc.Equals, "table1.col1")
-}
-
-func (s *ColumnSuite) TestDeferredLookupColumnSerializeSqlForColumnListInvalidName(
-	c *gc.C) {
-	col := table1.C("foo")
-
-	buf := &bytes.Buffer{}
-
-	err := col.SerializeSql(buf)
-	c.Assert(err, gc.NotNil)
-}
-
-func (s *ColumnSuite) TestDeferredLookupColumnSerializeSql(c *gc.C) {
-	col := table1.C("col1")
-
-	buf := &bytes.Buffer{}
-
-	err := col.SerializeSql(buf)
-	c.Assert(err, gc.IsNil)
-
-	sql := buf.String()
-	c.Assert(sql, gc.Equals, "table1.col1")
-}
-
-func (s *ColumnSuite) TestDeferredLookupColumnSerializeSqlInvalidName(c *gc.C) {
-	col := table1.C("foo")
-
-	buf := &bytes.Buffer{}
-
-	err := col.SerializeSql(buf)
-	c.Assert(err, gc.NotNil)
-}
-
-func (s *ColumnSuite) TestDeferredLookupColumnSetTableName(c *gc.C) {
-	col := table1.C("col1")
-
-	err := col.setTableName("foo")
-	c.Assert(err, gc.NotNil)
+	assertClauseSerialize(t, column, "col")
+	column.setTableName("table1")
+	assertClauseSerialize(t, column, "table1.col")
+	assertProjectionSerialize(t, column.defaultAliasProjection(), `table1.col AS "table1.col"`)
+	assertProjectionSerialize(t, column.AS("alias1"), `table1.col AS "alias1"`)
 }
diff --git a/sqlbuilder/column_test_old.go b/sqlbuilder/column_test_old.go
new file mode 100644
index 0000000..5f4e47b
--- /dev/null
+++ b/sqlbuilder/column_test_old.go
@@ -0,0 +1,210 @@
+// +build disabled
+
+package sqlbuilder
+
+import (
+	"bytes"
+	"testing"
+
+	gc "gopkg.in/check.v1"
+)
+
+func Test(t *testing.T) {
+	gc.TestingT(t)
+}
+
+type ColumnSuite struct {
+}
+
+var _ = gc.Suite(&ColumnSuite{})
+
+//
+// tests for columnImpl and columns that extends columnImpl
+//
+
+func (s *ColumnSuite) TestRealColumnName(c *gc.C) {
+	col := IntColumn("col", Nullable)
+
+	c.Assert(col.Name(), gc.Equals, "col")
+}
+
+func (s *ColumnSuite) TestRealColumnSerializeSqlForColumnList(c *gc.C) {
+	col := IntColumn("col", Nullable)
+
+	// Without tableName name
+	buf := &bytes.Buffer{}
+
+	err := col.SerializeSqlForColumnList(buf)
+	c.Assert(err, gc.IsNil)
+
+	sql := buf.String()
+	c.Assert(sql, gc.Equals, "col")
+
+	// With tableName name
+	err = col.setTableName("foo")
+	c.Assert(err, gc.IsNil)
+
+	buf = &bytes.Buffer{}
+
+	err = col.SerializeSqlForColumnList(buf)
+	c.Assert(err, gc.IsNil)
+
+	sql = buf.String()
+	c.Assert(sql, gc.Equals, "foo.col")
+}
+
+func (s *ColumnSuite) TestRealColumnSerializeSql(c *gc.C) {
+	col := IntColumn("col", Nullable)
+
+	// Without tableName name
+	buf := &bytes.Buffer{}
+
+	err := col.SerializeSql(buf)
+	c.Assert(err, gc.IsNil)
+
+	sql := buf.String()
+	c.Assert(sql, gc.Equals, "col")
+
+	// With tableName name
+	err = col.setTableName("foo")
+	c.Assert(err, gc.IsNil)
+
+	buf = &bytes.Buffer{}
+
+	err = col.SerializeSql(buf)
+	c.Assert(err, gc.IsNil)
+
+	sql = buf.String()
+	c.Assert(sql, gc.Equals, "foo.col")
+}
+
+//
+// tests for AliasCoulmns
+//
+
+func (s *ColumnSuite) TestAliasColumnName(c *gc.C) {
+	col := Alias("foo", SqlFunc("max", table1Col1))
+
+	c.Assert(col.Name(), gc.Equals, "foo")
+}
+
+func (s *ColumnSuite) TestAliasColumnSerializeSqlForColumnList(c *gc.C) {
+	col := Alias("foo", SqlFunc("max", table1Col1))
+
+	buf := &bytes.Buffer{}
+	err := col.SerializeSqlForColumnList(buf)
+	c.Assert(err, gc.IsNil)
+
+	sql := buf.String()
+	c.Assert(err, gc.IsNil)
+
+	c.Assert(sql, gc.Equals, "(max(table1.col1)) AS \"foo\"")
+}
+
+func (s *ColumnSuite) TestAliasColumnSerializeSqlForColumnListNilExpr(c *gc.C) {
+	col := Alias("foo", nil)
+
+	buf := &bytes.Buffer{}
+	err := col.SerializeSqlForColumnList(buf)
+	c.Assert(err, gc.NotNil)
+}
+
+func (s *ColumnSuite) TestAliasColumnSerializeSqlForColumnListInvalidAlias(
+	c *gc.C) {
+
+	col := Alias("1234", SqlFunc("max", table1Col1))
+
+	buf := &bytes.Buffer{}
+	err := col.SerializeSqlForColumnList(buf)
+	c.Assert(err, gc.NotNil)
+}
+
+func (s *ColumnSuite) TestAliasColumnSerializeSql(c *gc.C) {
+	col := Alias("foo", SqlFunc("max", table1Col1))
+
+	buf := &bytes.Buffer{}
+	err := col.SerializeSql(buf)
+	c.Assert(err, gc.IsNil)
+
+	sql := buf.String()
+	c.Assert(sql, gc.Equals, "`foo`")
+}
+
+func (s *ColumnSuite) TestAliasColumnSetTableName(c *gc.C) {
+	col := Alias("foo", SqlFunc("max", table1Col1))
+
+	// should always error
+	err := col.setTableName("test")
+	c.Assert(err, gc.NotNil)
+}
+
+//
+// tests for deferredLookkupColumnName
+//
+
+func (s *ColumnSuite) TestDeferredLookupColumnName(c *gc.C) {
+	col := table1.C("foo")
+
+	c.Assert(col.Name(), gc.Equals, "foo")
+}
+
+func (s *ColumnSuite) TestDeferredLookupColumnSerializeSqlForColumnList(
+	c *gc.C) {
+
+	col := table1.C("col1")
+
+	buf := &bytes.Buffer{}
+
+	err := col.SerializeSql(buf)
+	c.Assert(err, gc.IsNil)
+
+	sql := buf.String()
+	c.Assert(sql, gc.Equals, "table1.col1")
+
+	// check cached lookup
+	buf = &bytes.Buffer{}
+
+	err = col.SerializeSql(buf)
+	c.Assert(err, gc.IsNil)
+
+	sql = buf.String()
+	c.Assert(sql, gc.Equals, "table1.col1")
+}
+
+func (s *ColumnSuite) TestDeferredLookupColumnSerializeSqlForColumnListInvalidName(
+	c *gc.C) {
+	col := table1.C("foo")
+
+	buf := &bytes.Buffer{}
+
+	err := col.SerializeSql(buf)
+	c.Assert(err, gc.NotNil)
+}
+
+func (s *ColumnSuite) TestDeferredLookupColumnSerializeSql(c *gc.C) {
+	col := table1.C("col1")
+
+	buf := &bytes.Buffer{}
+
+	err := col.SerializeSql(buf)
+	c.Assert(err, gc.IsNil)
+
+	sql := buf.String()
+	c.Assert(sql, gc.Equals, "table1.col1")
+}
+
+func (s *ColumnSuite) TestDeferredLookupColumnSerializeSqlInvalidName(c *gc.C) {
+	col := table1.C("foo")
+
+	buf := &bytes.Buffer{}
+
+	err := col.SerializeSql(buf)
+	c.Assert(err, gc.NotNil)
+}
+
+func (s *ColumnSuite) TestDeferredLookupColumnSetTableName(c *gc.C) {
+	col := table1.C("col1")
+
+	err := col.setTableName("foo")
+	c.Assert(err, gc.NotNil)
+}
diff --git a/sqlbuilder/column_types.go b/sqlbuilder/column_types.go
index 4a27da1..f3cb25f 100644
--- a/sqlbuilder/column_types.go
+++ b/sqlbuilder/column_types.go
@@ -1,16 +1,29 @@
 package sqlbuilder
 
 //------------------------------------------------------//
-type BoolColumn struct {
-	boolInterfaceImpl
+type ColumnBool interface {
+	BoolExpression
+	column
 
-	baseColumn
+	From(table ExpressionTable) ColumnBool
 }
 
-func NewBoolColumn(name string, isNullable bool) *BoolColumn {
+type boolColumnImpl struct {
+	boolInterfaceImpl
 
-	boolColumn := &BoolColumn{}
-	boolColumn.baseColumn = newBaseColumn(name, isNullable, "", boolColumn)
+	columnImpl
+}
+
+func (i *boolColumnImpl) From(table ExpressionTable) ColumnBool {
+	newBoolColumn := BoolColumn(i.defaultAlias())
+	newBoolColumn.setTableName(table.Alias())
+	return newBoolColumn
+}
+
+func BoolColumn(name string) ColumnBool {
+
+	boolColumn := &boolColumnImpl{}
+	boolColumn.columnImpl = newColumn(name, "", boolColumn)
 
 	boolColumn.boolInterfaceImpl.parent = boolColumn
 
@@ -18,164 +31,241 @@ func NewBoolColumn(name string, isNullable bool) *BoolColumn {
 }
 
 //------------------------------------------------------//
-type FloatColumn struct {
-	floatInterfaceImpl
-	baseColumn
+type ColumnFloat interface {
+	FloatExpression
+	column
+
+	From(table ExpressionTable) ColumnFloat
 }
 
-func NewFloatColumn(name string, isNullable bool) *FloatColumn {
+type floatColumnImpl struct {
+	floatInterfaceImpl
+	columnImpl
+}
 
-	floatColumn := &FloatColumn{}
+func (i *floatColumnImpl) From(table ExpressionTable) ColumnFloat {
+	newFloatColumn := FloatColumn(i.defaultAlias())
+	newFloatColumn.setTableName(table.Alias())
+	return newFloatColumn
+}
+
+func FloatColumn(name string) ColumnFloat {
+
+	floatColumn := &floatColumnImpl{}
 
 	floatColumn.floatInterfaceImpl.parent = floatColumn
-
-	floatColumn.baseColumn = newBaseColumn(name, isNullable, "", floatColumn)
+	floatColumn.columnImpl = newColumn(name, "", floatColumn)
 
 	return floatColumn
 }
 
 //------------------------------------------------------//
-type IntegerColumn struct {
-	integerInterfaceImpl
+type ColumnInteger interface {
+	IntegerExpression
+	column
 
-	baseColumn
+	From(table ExpressionTable) ColumnInteger
 }
 
-// Representation of any integer column
-// This function will panic if name is not valid
-func NewIntegerColumn(name string, isNullable bool) *IntegerColumn {
-	integerColumn := &IntegerColumn{}
+type integerColumnImpl struct {
+	integerInterfaceImpl
+
+	columnImpl
+}
+
+func (i *integerColumnImpl) From(table ExpressionTable) ColumnInteger {
+	newIntColumn := IntegerColumn(i.defaultAlias())
+	newIntColumn.setTableName(table.Alias())
+	return newIntColumn
+}
+
+func IntegerColumn(name string) ColumnInteger {
+	integerColumn := &integerColumnImpl{}
 
 	integerColumn.integerInterfaceImpl.parent = integerColumn
-
-	integerColumn.baseColumn = newBaseColumn(name, isNullable, "", integerColumn)
+	integerColumn.columnImpl = newColumn(name, "", integerColumn)
 
 	return integerColumn
 }
 
 //------------------------------------------------------//
-type StringColumn struct {
-	stringInterfaceImpl
+type ColumnString interface {
+	StringExpression
+	column
 
-	baseColumn
+	From(table ExpressionTable) ColumnString
 }
 
-// Representation of any integer column
-// This function will panic if name is not valid
-func NewStringColumn(name string, isNullable bool) *StringColumn {
+type stringColumnImpl struct {
+	stringInterfaceImpl
 
-	stringColumn := &StringColumn{}
+	columnImpl
+}
+
+func (i *stringColumnImpl) From(table ExpressionTable) ColumnString {
+	newStrColumn := StringColumn(i.defaultAlias())
+	newStrColumn.setTableName(table.Alias())
+	return newStrColumn
+}
+
+func StringColumn(name string) ColumnString {
+
+	stringColumn := &stringColumnImpl{}
 
 	stringColumn.stringInterfaceImpl.parent = stringColumn
 
-	stringColumn.baseColumn = newBaseColumn(name, isNullable, "", stringColumn)
+	stringColumn.columnImpl = newColumn(name, "", stringColumn)
 
 	return stringColumn
 }
 
 //------------------------------------------------------//
-type TimeColumn struct {
-	timeInterfaceImpl
+type ColumnTime interface {
+	TimeExpression
+	column
 
-	baseColumn
+	From(table ExpressionTable) ColumnTime
 }
 
-// Representation of any integer column
-// This function will panic if name is not valid
-func NewTimeColumn(name string, isNullable bool) *TimeColumn {
-	timeColumn := &TimeColumn{}
+type timeColumnImpl struct {
+	timeInterfaceImpl
+
+	columnImpl
+}
+
+func (i *timeColumnImpl) From(table ExpressionTable) ColumnTime {
+	newTimeColumn := TimeColumn(i.defaultAlias())
+	newTimeColumn.setTableName(table.Alias())
+	return newTimeColumn
+}
+
+func TimeColumn(name string) ColumnTime {
+	timeColumn := &timeColumnImpl{}
 
 	timeColumn.timeInterfaceImpl.parent = timeColumn
 
-	timeColumn.baseColumn = newBaseColumn(name, isNullable, "", timeColumn)
+	timeColumn.columnImpl = newColumn(name, "", timeColumn)
 
 	return timeColumn
 }
 
 //------------------------------------------------------//
-type TimezColumn struct {
-	timezInterfaceImpl
 
-	baseColumn
+type ColumnTimez interface {
+	TimezExpression
+	column
+
+	From(table ExpressionTable) ColumnTimez
 }
 
-// Representation of any integer column
-// This function will panic if name is not valid
-func NewTimezColumn(name string, isNullable bool) *TimezColumn {
-	timezColumn := &TimezColumn{}
+type timezColumnImpl struct {
+	timezInterfaceImpl
+
+	columnImpl
+}
+
+func (i *timezColumnImpl) From(table ExpressionTable) ColumnTimez {
+	newTimezColumn := TimezColumn(i.defaultAlias())
+	newTimezColumn.setTableName(table.Alias())
+	return newTimezColumn
+}
+
+func TimezColumn(name string) ColumnTimez {
+	timezColumn := &timezColumnImpl{}
 
 	timezColumn.timezInterfaceImpl.parent = timezColumn
 
-	timezColumn.baseColumn = newBaseColumn(name, isNullable, "", timezColumn)
+	timezColumn.columnImpl = newColumn(name, "", timezColumn)
 
 	return timezColumn
 }
 
 //------------------------------------------------------//
-type TimestampColumn struct {
-	timestampInterfaceImpl
+type ColumnTimestamp interface {
+	TimestampExpression
+	column
 
-	baseColumn
+	From(table ExpressionTable) ColumnTimestamp
 }
 
-// Representation of any integer column
-// This function will panic if name is not valid
-func NewTimestampColumn(name string, isNullable bool) *TimestampColumn {
-	timestampColumn := &TimestampColumn{}
+type timestampColumnImpl struct {
+	timestampInterfaceImpl
+
+	columnImpl
+}
+
+func (i *timestampColumnImpl) From(table ExpressionTable) ColumnTimestamp {
+	newTimestampColumn := TimestampColumn(i.defaultAlias())
+	newTimestampColumn.setTableName(table.Alias())
+	return newTimestampColumn
+}
+
+func TimestampColumn(name string) ColumnTimestamp {
+	timestampColumn := &timestampColumnImpl{}
 
 	timestampColumn.timestampInterfaceImpl.parent = timestampColumn
 
-	timestampColumn.baseColumn = newBaseColumn(name, isNullable, "", timestampColumn)
+	timestampColumn.columnImpl = newColumn(name, "", timestampColumn)
 
 	return timestampColumn
 }
 
 //------------------------------------------------------//
-type TimestampzColumn struct {
-	timestampzInterfaceImpl
+type ColumnTimestampz interface {
+	TimestampzExpression
+	column
 
-	baseColumn
+	From(table ExpressionTable) ColumnTimestampz
 }
 
-// Representation of any integer column
-// This function will panic if name is not valid
-func NewTimestampzColumn(name string, isNullable bool) *TimestampzColumn {
-	timestampzColumn := &TimestampzColumn{}
+type timestampzColumnImpl struct {
+	timestampzInterfaceImpl
+
+	columnImpl
+}
+
+func (i *timestampzColumnImpl) From(table ExpressionTable) ColumnTimestampz {
+	newTimestampzColumn := TimestampzColumn(i.defaultAlias())
+	newTimestampzColumn.setTableName(table.Alias())
+	return newTimestampzColumn
+}
+
+func TimestampzColumn(name string) ColumnTimestampz {
+	timestampzColumn := &timestampzColumnImpl{}
 
 	timestampzColumn.timestampzInterfaceImpl.parent = timestampzColumn
 
-	timestampzColumn.baseColumn = newBaseColumn(name, isNullable, "", timestampzColumn)
+	timestampzColumn.columnImpl = newColumn(name, "", timestampzColumn)
 
 	return timestampzColumn
 }
 
 //------------------------------------------------------//
-type DateColumn struct {
-	dateInterfaceImpl
+type ColumnDate interface {
+	DateExpression
+	column
 
-	baseColumn
+	From(table ExpressionTable) ColumnDate
 }
 
-// Representation of any integer column
-// This function will panic if name is not valid
-func NewDateColumn(name string, isNullable bool) *DateColumn {
-	dateColumn := &DateColumn{}
+type dateColumnImpl struct {
+	dateInterfaceImpl
+
+	columnImpl
+}
+
+func (i *dateColumnImpl) From(table ExpressionTable) ColumnDate {
+	newDateColumn := DateColumn(i.defaultAlias())
+	newDateColumn.setTableName(table.Alias())
+	return newDateColumn
+}
+
+func DateColumn(name string) ColumnDate {
+	dateColumn := &dateColumnImpl{}
 
 	dateColumn.dateInterfaceImpl.parent = dateColumn
 
-	dateColumn.baseColumn = newBaseColumn(name, isNullable, "", dateColumn)
+	dateColumn.columnImpl = newColumn(name, "", dateColumn)
 
 	return dateColumn
 }
-
-// ------------------------------------------------------//
-type refColumn struct {
-	baseColumn
-}
-
-func RefColumn(name string) *refColumn {
-	refColumn := &refColumn{}
-	refColumn.baseColumn = newBaseColumn(name, false, "", refColumn)
-
-	return refColumn
-}
diff --git a/sqlbuilder/column_types_test.go b/sqlbuilder/column_types_test.go
index cc9fa9a..f6affb6 100644
--- a/sqlbuilder/column_types_test.go
+++ b/sqlbuilder/column_types_test.go
@@ -1,90 +1,45 @@
 package sqlbuilder
 
 import (
-	"gotest.tools/assert"
 	"testing"
 )
 
+var subQuery = table1.SELECT(table1ColFloat, table1ColInt).AsTable("sub_query")
+
 func TestNewBoolColumn(t *testing.T) {
-	boolColumn := NewBoolColumn("col", false)
+	boolColumn := BoolColumn("colBool").From(subQuery)
+	assertClauseSerialize(t, boolColumn, "sub_query.colBool")
+	assertClauseSerialize(t, boolColumn.EQ(Bool(true)), "(sub_query.colBool = $1)", true)
+	assertProjectionSerialize(t, boolColumn.defaultAliasProjection(), `sub_query.colBool AS "sub_query.colBool"`)
 
-	out := queryData{}
-	err := boolColumn.serialize(select_statement, &out)
-
-	assert.NilError(t, err)
-	assert.Equal(t, out.buff.String(), "col")
-
-	out.reset()
-	err = boolColumn.serialize(select_statement, &out)
-	assert.NilError(t, err)
-	assert.Equal(t, out.buff.String(), "col")
-
-	out.reset()
-	boolColumn.setTableName("table1")
-	err = boolColumn.DefaultAlias().serializeForProjection(select_statement, &out)
-	assert.NilError(t, err)
-	assert.Equal(t, out.buff.String(), `table1.col AS "table1.col"`)
-
-	out.reset()
-	boolColumn.setTableName("table1")
-	aliasedBoolColumn := boolColumn.AS("alias1")
-	err = aliasedBoolColumn.serializeForProjection(select_statement, &out)
-	assert.NilError(t, err)
-	assert.Equal(t, out.buff.String(), `table1.col AS "alias1"`)
+	boolColumn2 := table1ColBool.From(subQuery)
+	assertClauseSerialize(t, boolColumn2, `sub_query."table1.colBool"`)
+	assertClauseSerialize(t, boolColumn2.EQ(Bool(true)), `(sub_query."table1.colBool" = $1)`, true)
+	assertProjectionSerialize(t, boolColumn2.defaultAliasProjection(), `sub_query."table1.colBool" AS "sub_query.table1.colBool"`)
 }
 
 func TestNewIntColumn(t *testing.T) {
-	integerColumn := NewIntegerColumn("col", false)
+	intColumn := IntegerColumn("colInt").From(subQuery)
+	assertClauseSerialize(t, intColumn, "sub_query.colInt")
+	assertClauseSerialize(t, intColumn.EQ(Int(12)), "(sub_query.colInt = $1)", int64(12))
+	assertProjectionSerialize(t, intColumn.defaultAliasProjection(), `sub_query.colInt AS "sub_query.colInt"`)
 
-	out := queryData{}
-	err := integerColumn.serialize(select_statement, &out)
+	intColumn2 := table1ColInt.From(subQuery)
+	assertClauseSerialize(t, intColumn2, `sub_query."table1.colInt"`)
+	assertClauseSerialize(t, intColumn2.EQ(Int(14)), `(sub_query."table1.colInt" = $1)`, int64(14))
+	assertProjectionSerialize(t, intColumn2.defaultAliasProjection(), `sub_query."table1.colInt" AS "sub_query.table1.colInt"`)
 
-	assert.NilError(t, err)
-	assert.Equal(t, out.buff.String(), "col")
-
-	out.reset()
-	err = integerColumn.serialize(select_statement, &out)
-	assert.NilError(t, err)
-	assert.Equal(t, out.buff.String(), "col")
-
-	out.reset()
-	integerColumn.setTableName("table1")
-	err = integerColumn.DefaultAlias().serializeForProjection(select_statement, &out)
-	assert.NilError(t, err)
-	assert.Equal(t, out.buff.String(), `table1.col AS "table1.col"`)
-
-	out.reset()
-	integerColumn.setTableName("table1")
-	aliasedBoolColumn := integerColumn.AS("alias1")
-	err = aliasedBoolColumn.serializeForProjection(select_statement, &out)
-	assert.NilError(t, err)
-	assert.Equal(t, out.buff.String(), `table1.col AS "alias1"`)
 }
 
-func TestNewNumericColumnColumn(t *testing.T) {
-	numericColumn := NewFloatColumn("col", false)
+func TestNewFloatColumnColumn(t *testing.T) {
+	floatColumn := FloatColumn("colFloat").From(subQuery)
+	assertClauseSerialize(t, floatColumn, "sub_query.colFloat")
+	assertClauseSerialize(t, floatColumn.EQ(Float(1.11)), "(sub_query.colFloat = $1)", float64(1.11))
+	assertProjectionSerialize(t, floatColumn.defaultAliasProjection(), `sub_query.colFloat AS "sub_query.colFloat"`)
 
-	out := queryData{}
-	err := numericColumn.serialize(select_statement, &out)
+	floatColumn2 := table1ColFloat.From(subQuery)
+	assertClauseSerialize(t, floatColumn2, `sub_query."table1.colFloat"`)
+	assertClauseSerialize(t, floatColumn2.EQ(Float(2.22)), `(sub_query."table1.colFloat" = $1)`, float64(2.22))
+	assertProjectionSerialize(t, floatColumn2.defaultAliasProjection(), `sub_query."table1.colFloat" AS "sub_query.table1.colFloat"`)
 
-	assert.NilError(t, err)
-	assert.Equal(t, out.buff.String(), "col")
-
-	out.reset()
-	err = numericColumn.serialize(select_statement, &out)
-	assert.NilError(t, err)
-	assert.Equal(t, out.buff.String(), "col")
-
-	out.reset()
-	numericColumn.setTableName("table1")
-	err = numericColumn.DefaultAlias().serializeForProjection(select_statement, &out)
-	assert.NilError(t, err)
-	assert.Equal(t, out.buff.String(), `table1.col AS "table1.col"`)
-
-	out.reset()
-	numericColumn.setTableName("table1")
-	aliasedBoolColumn := numericColumn.AS("alias1")
-	err = aliasedBoolColumn.serializeForProjection(select_statement, &out)
-	assert.NilError(t, err)
-	assert.Equal(t, out.buff.String(), `table1.col AS "alias1"`)
 }
diff --git a/sqlbuilder/expression_table.go b/sqlbuilder/expression_table.go
index 0e190e1..c5af486 100644
--- a/sqlbuilder/expression_table.go
+++ b/sqlbuilder/expression_table.go
@@ -2,12 +2,10 @@ package sqlbuilder
 
 import "errors"
 
-type expressionTable interface {
+type ExpressionTable interface {
 	ReadableTable
 
-	RefIntColumnName(name string) *IntegerColumn
-	RefIntColumn(column Column) *IntegerColumn
-	RefStringColumn(column Column) *StringColumn
+	Alias() string
 }
 
 type expressionTableImpl struct {
@@ -16,7 +14,7 @@ type expressionTableImpl struct {
 	alias      string
 }
 
-func newExpressionTable(expression Expression, alias string) expressionTable {
+func newExpressionTable(expression Expression, alias string) ExpressionTable {
 	expTable := &expressionTableImpl{expression: expression, alias: alias}
 
 	expTable.readableTableInterfaceImpl.parent = expTable
@@ -24,40 +22,15 @@ func newExpressionTable(expression Expression, alias string) expressionTable {
 	return expTable
 }
 
-// Returns the tableName's name in the database
-func (e *expressionTableImpl) SchemaName() string {
-	return ""
-}
-
-func (e *expressionTableImpl) TableName() string {
+func (e *expressionTableImpl) Alias() string {
 	return e.alias
 }
 
-func (e *expressionTableImpl) RefIntColumnName(name string) *IntegerColumn {
-	intColumn := NewIntegerColumn(name, false)
-	intColumn.setTableName(e.alias)
-
-	return intColumn
-}
-
-func (e *expressionTableImpl) RefIntColumn(column Column) *IntegerColumn {
-	intColumn := NewIntegerColumn(column.TableName()+"."+column.Name(), false)
-	intColumn.setTableName(e.alias)
-
-	return intColumn
-}
-
-func (e *expressionTableImpl) RefStringColumn(column Column) *StringColumn {
-	strColumn := NewStringColumn(column.TableName()+"."+column.Name(), false)
-	strColumn.setTableName(e.alias)
-	return strColumn
-}
-
 func (e *expressionTableImpl) serialize(statement statementType, out *queryData, options ...serializeOption) error {
 	if e == nil {
 		return errors.New("Expression table is nil. ")
 	}
-	//out.writeString("( ")
+
 	err := e.expression.serialize(statement, out)
 
 	if err != nil {
diff --git a/sqlbuilder/projection.go b/sqlbuilder/projection.go
index 6e5e189..d111c9f 100644
--- a/sqlbuilder/projection.go
+++ b/sqlbuilder/projection.go
@@ -29,7 +29,7 @@ func (cl ColumnList) DefaultAlias() []projection {
 	newColumnList := []projection{}
 
 	for _, column := range cl {
-		newColumn := column.DefaultAlias()
+		newColumn := column.defaultAliasProjection()
 		newColumnList = append(newColumnList, newColumn)
 	}
 
diff --git a/sqlbuilder/select_statement.go b/sqlbuilder/select_statement.go
index 54ee06f..d236bf8 100644
--- a/sqlbuilder/select_statement.go
+++ b/sqlbuilder/select_statement.go
@@ -23,7 +23,7 @@ type SelectStatement interface {
 
 	FOR_UPDATE() SelectStatement
 
-	AsTable(alias string) expressionTable
+	AsTable(alias string) ExpressionTable
 }
 
 func SELECT(projection ...projection) SelectStatement {
@@ -54,7 +54,7 @@ func defaultProjectionAliasing(projections []projection) []projection {
 
 	for _, projection := range projections {
 		if column, ok := projection.(Column); ok {
-			aliasedProjections = append(aliasedProjections, column.DefaultAlias())
+			aliasedProjections = append(aliasedProjections, column.defaultAliasProjection())
 		} else if columnList, ok := projection.(ColumnList); ok {
 			aliasedProjections = append(aliasedProjections, columnList.DefaultAlias()...)
 		} else {
@@ -204,7 +204,7 @@ func (s *selectStatementImpl) DebugSql() (query string, err error) {
 	return DebugSql(s)
 }
 
-func (s *selectStatementImpl) AsTable(alias string) expressionTable {
+func (s *selectStatementImpl) AsTable(alias string) ExpressionTable {
 	return newExpressionTable(s.parent, alias)
 }
 
diff --git a/sqlbuilder/set_statement.go b/sqlbuilder/set_statement.go
index 5f69177..07d8456 100644
--- a/sqlbuilder/set_statement.go
+++ b/sqlbuilder/set_statement.go
@@ -15,7 +15,7 @@ type SetStatement interface {
 	LIMIT(limit int64) SetStatement
 	OFFSET(offset int64) SetStatement
 
-	AsTable(alias string) expressionTable
+	AsTable(alias string) ExpressionTable
 }
 
 const (
@@ -91,7 +91,7 @@ func (us *setStatementImpl) OFFSET(offset int64) SetStatement {
 	return us
 }
 
-func (us *setStatementImpl) AsTable(alias string) expressionTable {
+func (us *setStatementImpl) AsTable(alias string) ExpressionTable {
 	return newExpressionTable(us.parent, alias)
 }
 
diff --git a/sqlbuilder/test_utils.go b/sqlbuilder/test_utils.go
index 75ed415..5de7458 100644
--- a/sqlbuilder/test_utils.go
+++ b/sqlbuilder/test_utils.go
@@ -6,12 +6,12 @@ import (
 	"testing"
 )
 
-var table1Col1 = NewIntegerColumn("col1", true)
-var table1ColInt = NewIntegerColumn("colInt", true)
-var table1ColFloat = NewFloatColumn("colFloat", true)
-var table1Col3 = NewIntegerColumn("col3", true)
-var table1ColTime = NewTimeColumn("colTime", true)
-var table1ColBool = NewBoolColumn("colBool", true)
+var table1Col1 = IntegerColumn("col1")
+var table1ColInt = IntegerColumn("colInt")
+var table1ColFloat = FloatColumn("colFloat")
+var table1Col3 = IntegerColumn("col3")
+var table1ColTime = TimeColumn("colTime")
+var table1ColBool = BoolColumn("colBool")
 
 var table1 = NewTable(
 	"db",
@@ -23,13 +23,13 @@ var table1 = NewTable(
 	table1ColTime,
 	table1ColBool)
 
-var table2Col3 = NewIntegerColumn("col3", true)
-var table2Col4 = NewIntegerColumn("col4", true)
-var table2ColInt = NewIntegerColumn("colInt", true)
-var table2ColFloat = NewFloatColumn("colFloat", true)
-var table2ColStr = NewStringColumn("colStr", true)
-var table2ColBool = NewBoolColumn("colBool", true)
-var table2ColTime = NewTimeColumn("colTime", true)
+var table2Col3 = IntegerColumn("col3")
+var table2Col4 = IntegerColumn("col4")
+var table2ColInt = IntegerColumn("colInt")
+var table2ColFloat = FloatColumn("colFloat")
+var table2ColStr = StringColumn("colStr")
+var table2ColBool = BoolColumn("colBool")
+var table2ColTime = TimeColumn("colTime")
 
 var table2 = NewTable(
 	"db",
@@ -42,9 +42,9 @@ var table2 = NewTable(
 	table2ColBool,
 	table2ColTime)
 
-var table3Col1 = NewIntegerColumn("col1", true)
-var table3ColInt = NewIntegerColumn("colInt", true)
-var table3StrCol = NewStringColumn("col2", true)
+var table3Col1 = IntegerColumn("col1")
+var table3ColInt = IntegerColumn("colInt")
+var table3StrCol = StringColumn("col2")
 var table3 = NewTable(
 	"db",
 	"table3",
diff --git a/tests/select_test.go b/tests/select_test.go
index f6e1bc9..f5d4a9d 100644
--- a/tests/select_test.go
+++ b/tests/select_test.go
@@ -203,7 +203,7 @@ FROM dvds.film_actor
      INNER JOIN dvds.inventory ON (inventory.film_id = film.film_id)
      INNER JOIN dvds.rental ON (rental.inventory_id = inventory.inventory_id)
 ORDER BY film.film_id ASC
-LIMIT 50;
+LIMIT 500;
 `
 	for i := 0; i < 1; i++ {
 		query := FilmActor.
@@ -222,9 +222,9 @@ LIMIT 50;
 			).
 			//WHERE(FilmActor.ActorID.GtEqL(1).AND(FilmActor.ActorID.LtEqL(2))).
 			ORDER_BY(Film.FilmID.ASC()).
-			LIMIT(50)
+			LIMIT(500)
 
-		assertQuery(t, query, expectedSql, int64(50))
+		assertQuery(t, query, expectedSql, int64(500))
 
 		var languageActorFilm []struct {
 			model.Language
@@ -247,7 +247,7 @@ LIMIT 50;
 
 		assert.NilError(t, err)
 		assert.Equal(t, len(languageActorFilm), 1)
-		assert.Equal(t, len(languageActorFilm[0].Films), 1)
+		assert.Equal(t, len(languageActorFilm[0].Films), 6)
 		assert.Equal(t, len(languageActorFilm[0].Films[0].Actors), 10)
 	}
 
@@ -708,8 +708,7 @@ SELECT actor.actor_id AS "actor.actor_id",
      film_actor.actor_id AS "film_actor.actor_id",
      film_actor.film_id AS "film_actor.film_id",
      film_actor.last_update AS "film_actor.last_update",
-     films."film.title" AS "film.title",
-     films."film.rating" AS "film.rating"
+     rfilms."film.title" AS "film.title"
 FROM dvds.actor
      INNER JOIN dvds.film_actor ON (actor.actor_id = film_actor.film_id)
      INNER JOIN (
@@ -718,28 +717,28 @@ FROM dvds.actor
                film.rating AS "film.rating"
           FROM dvds.film
           WHERE film.rating = 'R'
-     ) AS films ON (film_actor.film_id = films."film.film_id");
+     ) AS rfilms ON (film_actor.film_id = rfilms."film.film_id");
 `
 
-	rFilmsOnly := Film.
+	rRatingFilms := Film.
 		SELECT(
 			Film.FilmID,
 			Film.Title,
 			Film.Rating,
 		).
 		WHERE(Film.Rating.EQ(enum.MpaaRating.R)).
-		AsTable("films")
+		AsTable("rfilms")
 
-	rFilmId := rFilmsOnly.RefIntColumn(Film.FilmID)
+	rFilmId := Film.FilmID.From(rRatingFilms)
+	rTitle := Film.Title.From(rRatingFilms)
 
 	query := Actor.
 		INNER_JOIN(FilmActor, Actor.ActorID.EQ(FilmActor.FilmID)).
-		INNER_JOIN(rFilmsOnly, FilmActor.FilmID.EQ(rFilmId)).
+		INNER_JOIN(rRatingFilms, FilmActor.FilmID.EQ(rFilmId)).
 		SELECT(
 			Actor.AllColumns,
 			FilmActor.AllColumns,
-			rFilmsOnly.RefStringColumn(Film.Title).AS("film.title"),
-			rFilmsOnly.RefStringColumn(Film.Rating).AS("film.rating"),
+			rTitle.AS("film.title"),
 		)
 
 	fmt.Println(query.Sql())
@@ -914,24 +913,24 @@ FROM dvds.customer
 ORDER BY customer_payment_sum.amount_sum ASC;
 `
 
-	customersPaymentSubQuery := Payment.
+	customersPayments := Payment.
 		SELECT(
 			Payment.CustomerID,
 			SUMf(Payment.Amount).AS("amount_sum"),
 		).
-		GROUP_BY(Payment.CustomerID)
+		GROUP_BY(Payment.CustomerID).
+		AsTable("customer_payment_sum")
 
-	customersPaymentTable := customersPaymentSubQuery.AsTable("customer_payment_sum")
-	amountSumColumn := customersPaymentTable.RefIntColumnName("amount_sum")
-	customerId := customersPaymentTable.RefIntColumn(Payment.CustomerID)
+	customerId := Payment.CustomerID.From(customersPayments)
+	amountSum := FloatColumn("amount_sum").From(customersPayments)
 
 	query := Customer.
-		INNER_JOIN(customersPaymentTable, Customer.CustomerID.EQ(customerId)).
+		INNER_JOIN(customersPayments, Customer.CustomerID.EQ(customerId)).
 		SELECT(
 			Customer.AllColumns,
-			amountSumColumn.AS("customer_with_amounts.amount_sum"),
+			amountSum.AS("customer_with_amounts.amount_sum"),
 		).
-		ORDER_BY(amountSumColumn.ASC())
+		ORDER_BY(amountSum.ASC())
 
 	assertQuery(t, query, expectedSql)
 
@@ -1039,7 +1038,7 @@ OFFSET 20;
 			SELECT(Payment.PaymentID, Payment.Amount).
 			WHERE(Payment.Amount.GT_EQ(Float(200))),
 	).
-		ORDER_BY(RefColumn("payment.payment_id").ASC(), Payment.Amount.DESC()).
+		ORDER_BY(IntegerColumn("payment.payment_id").ASC(), Payment.Amount.DESC()).
 		LIMIT(10).
 		OFFSET(20)