diff --git a/mysql/mysql_types.go b/mysql/mysql_types.go
index acf9e07..b556003 100644
--- a/mysql/mysql_types.go
+++ b/mysql/mysql_types.go
@@ -74,3 +74,8 @@ var MINUSf = jet.MINUSf
 var BIT_NOT = jet.BIT_NOT
 
 var SELECT = jet.SELECT
+
+//-----------------literals----------------------//
+
+var STAR = jet.STAR
+var NULL = jet.NULL
diff --git a/tests/mysql/alltypes_test.go b/tests/mysql/alltypes_test.go
index d877601..9f5ac12 100644
--- a/tests/mysql/alltypes_test.go
+++ b/tests/mysql/alltypes_test.go
@@ -27,6 +27,67 @@ func TestAllTypes(t *testing.T) {
 	testutils.AssertJSON(t, dest, allTypesJson)
 }
 
+func TestExpressionOperators(t *testing.T) {
+	query := AllTypes.SELECT(
+		AllTypes.Integer.IS_NULL().AS("result.is_null"),
+		AllTypes.DatePtr.IS_NOT_NULL().AS("result.is_not_null"),
+		AllTypes.SmallIntPtr.IN(Int(11), Int(22)).AS("result.in"),
+		AllTypes.SmallIntPtr.IN(AllTypes.SELECT(AllTypes.Integer)).AS("result.in_select"),
+		AllTypes.SmallIntPtr.NOT_IN(Int(11), Int(22), NULL).AS("result.not_in"),
+		AllTypes.SmallIntPtr.NOT_IN(AllTypes.SELECT(AllTypes.Integer)).AS("result.not_in_select"),
+	).LIMIT(2)
+
+	//fmt.Println(query.Sql())
+
+	testutils.AssertStatementSql(t, query, `
+SELECT all_types.integer IS NULL AS "result.is_null",
+     all_types.date_ptr IS NOT NULL AS "result.is_not_null",
+     (all_types.small_int_ptr IN (?, ?)) AS "result.in",
+     (all_types.small_int_ptr IN ((
+          SELECT all_types.integer AS "all_types.integer"
+          FROM test_sample.all_types
+     ))) AS "result.in_select",
+     (all_types.small_int_ptr NOT IN (?, ?, NULL)) AS "result.not_in",
+     (all_types.small_int_ptr NOT IN ((
+          SELECT all_types.integer AS "all_types.integer"
+          FROM test_sample.all_types
+     ))) AS "result.not_in_select"
+FROM test_sample.all_types
+LIMIT ?;
+`, int64(11), int64(22), int64(11), int64(22), int64(2))
+
+	var dest []struct {
+		common.ExpressionTestResult `alias:"result.*"`
+	}
+
+	err := query.Query(db, &dest)
+
+	assert.NilError(t, err)
+
+	//testutils.JsonPrint(dest)
+
+	testutils.AssertJSON(t, dest, `
+[
+	{
+		"IsNull": false,
+		"IsNotNull": true,
+		"In": false,
+		"InSelect": false,
+		"NotIn": null,
+		"NotInSelect": true
+	},
+	{
+		"IsNull": false,
+		"IsNotNull": false,
+		"In": null,
+		"InSelect": null,
+		"NotIn": null,
+		"NotInSelect": null
+	}
+]
+`)
+}
+
 func TestBoolOperators(t *testing.T) {
 	query := AllTypes.SELECT(
 		AllTypes.Boolean.EQ(AllTypes.BooleanPtr).AS("EQ1"),
diff --git a/tests/postgres/alltypes_test.go b/tests/postgres/alltypes_test.go
index 558a5d0..73df9b7 100644
--- a/tests/postgres/alltypes_test.go
+++ b/tests/postgres/alltypes_test.go
@@ -58,13 +58,68 @@ func TestAllTypesInsertQuery(t *testing.T) {
 
 func TestExpressionOperators(t *testing.T) {
 	query := AllTypes.SELECT(
-		AllTypes.Integer.IS_NULL(),
-		AllTypes.Timestamp.IS_NOT_NULL(),
-		AllTypes.SmallIntPtr.IN(Int(11), Int(22), NULL),
-		AllTypes.SmallIntPtr.IN(AllTypes.SELECT(AllTypes.IntegerPtr)),
-		AllTypes.SmallIntPtr.NOT_IN(Int(11), Int(22), NULL),
-		AllTypes.SmallIntPtr.NOT_IN(AllTypes.SELECT(AllTypes.IntegerPtr)),
+		AllTypes.Integer.IS_NULL().AS("result.is_null"),
+		AllTypes.DatePtr.IS_NOT_NULL().AS("result.is_not_null"),
+		AllTypes.SmallIntPtr.IN(Int(11), Int(22)).AS("result.in"),
+		AllTypes.SmallIntPtr.IN(AllTypes.SELECT(AllTypes.Integer)).AS("result.in_select"),
+		AllTypes.SmallIntPtr.NOT_IN(Int(11), Int(22), NULL).AS("result.not_in"),
+		AllTypes.SmallIntPtr.NOT_IN(AllTypes.SELECT(AllTypes.Integer)).AS("result.not_in_select"),
+	).LIMIT(2)
 
+	//fmt.Println(query.Sql())
+
+	testutils.AssertStatementSql(t, query, `
+SELECT all_types.integer IS NULL AS "result.is_null",
+     all_types.date_ptr IS NOT NULL AS "result.is_not_null",
+     (all_types.small_int_ptr IN ($1, $2)) AS "result.in",
+     (all_types.small_int_ptr IN ((
+          SELECT all_types.integer AS "all_types.integer"
+          FROM test_sample.all_types
+     ))) AS "result.in_select",
+     (all_types.small_int_ptr NOT IN ($3, $4, NULL)) AS "result.not_in",
+     (all_types.small_int_ptr NOT IN ((
+          SELECT all_types.integer AS "all_types.integer"
+          FROM test_sample.all_types
+     ))) AS "result.not_in_select"
+FROM test_sample.all_types
+LIMIT $5;
+`, int64(11), int64(22), int64(11), int64(22), int64(2))
+
+	var dest []struct {
+		common.ExpressionTestResult `alias:"result.*"`
+	}
+
+	err := query.Query(db, &dest)
+
+	assert.NilError(t, err)
+
+	//testutils.JsonPrint(dest)
+
+	testutils.AssertJSON(t, dest, `
+[
+	{
+		"IsNull": false,
+		"IsNotNull": true,
+		"In": false,
+		"InSelect": false,
+		"NotIn": null,
+		"NotInSelect": true
+	},
+	{
+		"IsNull": false,
+		"IsNotNull": false,
+		"In": null,
+		"InSelect": null,
+		"NotIn": null,
+		"NotInSelect": null
+	}
+]
+`)
+}
+
+func TestExpressionCast(t *testing.T) {
+
+	query := AllTypes.SELECT(
 		postgres.CAST(Int(150)).AS_CHAR(12),
 		postgres.CAST(String("TRUE")).AS_BOOL(),
 		postgres.CAST(String("111")).AS_SMALLINT(),
diff --git a/tests/testdata/common/common.go b/tests/testdata/common/common.go
index 55f6554..60ebf7c 100644
--- a/tests/testdata/common/common.go
+++ b/tests/testdata/common/common.go
@@ -1,5 +1,14 @@
 package common
 
+type ExpressionTestResult struct {
+	IsNull      *bool
+	IsNotNull   *bool
+	In          *bool
+	InSelect    *bool
+	NotIn       *bool
+	NotInSelect *bool
+}
+
 type EqualityExpResult struct {
 	Eq1          *bool
 	Eq2          *bool