diff --git a/core/builder.go b/core/builder.go
index d2c6931..0220405 100644
--- a/core/builder.go
+++ b/core/builder.go
@@ -4,7 +4,11 @@
 
 package core
 
-import "github.com/issue9/errwrap"
+import (
+	"strings"
+
+	"github.com/issue9/errwrap"
+)
 
 // 作用于表名，列名等非关键字上的引号占位符。
 // 在执行会自动替换成该数据库相应的符号。
@@ -56,6 +60,16 @@ func (b *Builder) Quote(str string, l, r byte) *Builder { return b.WBytes(l).WSt
 // QuoteKey 给 str 左右添加 [QuoteLeft] 和 [QuoteRight] 两个字符
 func (b *Builder) QuoteKey(str string) *Builder { return b.Quote(str, QuoteLeft, QuoteRight) }
 
+// QuoteColumn 为列名添加 [QuoteLeft] 和 [QuoteRight] 两个字符
+//
+// NOTE: 列名可能包含表名或是表名别名：table.col
+func (b *Builder) QuoteColumn(col string) *Builder {
+	if index := strings.IndexByte(col, '.'); index > 0 {
+		return b.QuoteKey(col[:index]).WBytes('.').QuoteKey(col[index+1:])
+	}
+	return b.Quote(col, QuoteLeft, QuoteRight)
+}
+
 // Reset 重置内容，同时也会将 err 设置为 nil
 func (b *Builder) Reset() *Builder {
 	b.buffer.Reset()
diff --git a/sqlbuilder/where.go b/sqlbuilder/where.go
index 37a826f..db04245 100644
--- a/sqlbuilder/where.go
+++ b/sqlbuilder/where.go
@@ -135,35 +135,35 @@ func (stmt *WhereStmt) Or(cond string, args ...any) *WhereStmt {
 // AndIsNull 指定 WHERE ... AND col IS NULL
 func (stmt *WhereStmt) AndIsNull(col string) *WhereStmt {
 	stmt.writeAnd(true)
-	stmt.builder.QuoteKey(col).WString(" IS NULL ")
+	stmt.builder.QuoteColumn(col).WString(" IS NULL ")
 	return stmt
 }
 
 // OrIsNull 指定 WHERE ... OR col IS NULL
 func (stmt *WhereStmt) OrIsNull(col string) *WhereStmt {
 	stmt.writeAnd(false)
-	stmt.builder.QuoteKey(col).WString(" IS NULL ")
+	stmt.builder.QuoteColumn(col).WString(" IS NULL ")
 	return stmt
 }
 
 // AndIsNotNull 指定 WHERE ... AND col IS NOT NULL
 func (stmt *WhereStmt) AndIsNotNull(col string) *WhereStmt {
 	stmt.writeAnd(true)
-	stmt.builder.QuoteKey(col).WString(" IS NOT NULL ")
+	stmt.builder.QuoteColumn(col).WString(" IS NOT NULL ")
 	return stmt
 }
 
 // OrIsNotNull 指定 WHERE ... OR col IS NOT NULL
 func (stmt *WhereStmt) OrIsNotNull(col string) *WhereStmt {
 	stmt.writeAnd(false)
-	stmt.builder.QuoteKey(col).WString(" IS NOT NULL ")
+	stmt.builder.QuoteColumn(col).WString(" IS NOT NULL ")
 	return stmt
 }
 
 // AndBetween 指定 WHERE ... AND col BETWEEN v1 AND v2
 func (stmt *WhereStmt) AndBetween(col string, v1, v2 any) *WhereStmt {
 	stmt.writeAnd(true)
-	stmt.builder.QuoteKey(col).WString(" BETWEEN ? AND ? ")
+	stmt.builder.QuoteColumn(col).WString(" BETWEEN ? AND ? ")
 	stmt.args = append(stmt.args, v1, v2)
 	return stmt
 }
@@ -171,7 +171,7 @@ func (stmt *WhereStmt) AndBetween(col string, v1, v2 any) *WhereStmt {
 // OrBetween 指定 WHERE ... OR col BETWEEN v1 AND v2
 func (stmt *WhereStmt) OrBetween(col string, v1, v2 any) *WhereStmt {
 	stmt.writeAnd(false)
-	stmt.builder.QuoteKey(col).WString(" BETWEEN ? AND ? ")
+	stmt.builder.QuoteColumn(col).WString(" BETWEEN ? AND ? ")
 	stmt.args = append(stmt.args, v1, v2)
 	return stmt
 }
@@ -179,7 +179,7 @@ func (stmt *WhereStmt) OrBetween(col string, v1, v2 any) *WhereStmt {
 // AndNotBetween 指定 WHERE ... AND col NOT BETWEEN v1 AND v2
 func (stmt *WhereStmt) AndNotBetween(col string, v1, v2 any) *WhereStmt {
 	stmt.writeAnd(true)
-	stmt.builder.QuoteKey(col).WString(" NOT BETWEEN ? AND ? ")
+	stmt.builder.QuoteColumn(col).WString(" NOT BETWEEN ? AND ? ")
 	stmt.args = append(stmt.args, v1, v2)
 	return stmt
 }
@@ -187,7 +187,7 @@ func (stmt *WhereStmt) AndNotBetween(col string, v1, v2 any) *WhereStmt {
 // OrNotBetween 指定 WHERE ... OR col BETWEEN v1 AND v2
 func (stmt *WhereStmt) OrNotBetween(col string, v1, v2 any) *WhereStmt {
 	stmt.writeAnd(false)
-	stmt.builder.QuoteKey(col).WString(" NOT BETWEEN ? AND ? ")
+	stmt.builder.QuoteColumn(col).WString(" NOT BETWEEN ? AND ? ")
 	stmt.args = append(stmt.args, v1, v2)
 	return stmt
 }
@@ -195,7 +195,7 @@ func (stmt *WhereStmt) OrNotBetween(col string, v1, v2 any) *WhereStmt {
 // AndLike 指定 WHERE ... AND col LIKE content
 func (stmt *WhereStmt) AndLike(col string, content any) *WhereStmt {
 	stmt.writeAnd(true)
-	stmt.builder.QuoteKey(col).WString(" LIKE ?")
+	stmt.builder.QuoteColumn(col).WString(" LIKE ?")
 	stmt.args = append(stmt.args, content)
 	return stmt
 }
@@ -203,7 +203,7 @@ func (stmt *WhereStmt) AndLike(col string, content any) *WhereStmt {
 // OrLike 指定 WHERE ... OR col LIKE content
 func (stmt *WhereStmt) OrLike(col string, content any) *WhereStmt {
 	stmt.writeAnd(false)
-	stmt.builder.QuoteKey(col).WString(" LIKE ?")
+	stmt.builder.QuoteColumn(col).WString(" LIKE ?")
 	stmt.args = append(stmt.args, content)
 	return stmt
 }
@@ -211,7 +211,7 @@ func (stmt *WhereStmt) OrLike(col string, content any) *WhereStmt {
 // AndNotLike 指定 WHERE ... AND col NOT LIKE content
 func (stmt *WhereStmt) AndNotLike(col string, content any) *WhereStmt {
 	stmt.writeAnd(true)
-	stmt.builder.QuoteKey(col).WString(" NOT LIKE ?")
+	stmt.builder.QuoteColumn(col).WString(" NOT LIKE ?")
 	stmt.args = append(stmt.args, content)
 	return stmt
 }
@@ -219,7 +219,7 @@ func (stmt *WhereStmt) AndNotLike(col string, content any) *WhereStmt {
 // OrNotLike 指定 WHERE ... OR col NOT LIKE content
 func (stmt *WhereStmt) OrNotLike(col string, content any) *WhereStmt {
 	stmt.writeAnd(false)
-	stmt.builder.QuoteKey(col).WString(" NOT LIKE ?")
+	stmt.builder.QuoteColumn(col).WString(" NOT LIKE ?")
 	stmt.args = append(stmt.args, content)
 	return stmt
 }
@@ -250,7 +250,7 @@ func (stmt *WhereStmt) in(and, not bool, col string, v ...any) *WhereStmt {
 	}
 
 	stmt.writeAnd(and)
-	stmt.builder.QuoteKey(col)
+	stmt.builder.QuoteColumn(col)
 
 	if not {
 		stmt.builder.WString(" NOT")
diff --git a/sqlbuilder/where_test.go b/sqlbuilder/where_test.go
index 64ff868..6c0dda0 100644
--- a/sqlbuilder/where_test.go
+++ b/sqlbuilder/where_test.go
@@ -71,10 +71,10 @@ func TestWhereStmt_IsNull(t *testing.T) {
 	a.NotError(err).Empty(args)
 	sqltest.Equal(a, query, "{col1} is null")
 
-	w.OrIsNull("col2")
+	w.OrIsNull("tbl.col2")
 	query, args, err = w.SQL()
 	a.NotError(err).Empty(args)
-	sqltest.Equal(a, query, "{col1} is null or {col2} is null")
+	sqltest.Equal(a, query, "{col1} is null or {tbl}.{col2} is null")
 
 	w.Reset()
 	w.AndIsNotNull("col1")