Add support for DELETE statements.

sqlbuilder/delete_statement_test.go

@@ -0,0 +1,18 @@
+package sqlbuilder
+
+import (
+	"gotest.tools/assert"
+	"testing"
+)
+
+func TestDeleteUnconditionally(t *testing.T) {
+	_, err := table1.Delete().String()
+	assert.Assert(t, err != nil)
+}
+
+func TestDeleteWithWhere(t *testing.T) {
+	sql, err := table1.Delete().WHERE(table1Col1.EqL(1)).String()
+	assert.NilError(t, err)
+
+	assert.Equal(t, sql, "DELETE FROM db.table1 WHERE table1.col1 = 1;")
+}