diff --git a/go.mod b/go.mod
index 5822871..c843dfa 100644
--- a/go.mod
+++ b/go.mod
@@ -1 +1,3 @@
 module github.com/huandu/go-sqlbuilder
+
+go 1.12
diff --git a/select.go b/select.go
index 395a27e..e88e38a 100644
--- a/select.go
+++ b/select.go
@@ -69,7 +69,7 @@ func (sb *SelectBuilder) Distinct() *SelectBuilder {
 
 // Select sets columns in SELECT.
 func (sb *SelectBuilder) Select(col ...string) *SelectBuilder {
-	sb.selectCols = EscapeAll(col...)
+	sb.selectCols = col
 	return sb
 }
 
@@ -118,13 +118,13 @@ func (sb *SelectBuilder) Having(andExpr ...string) *SelectBuilder {
 
 // GroupBy sets columns of GROUP BY in SELECT.
 func (sb *SelectBuilder) GroupBy(col ...string) *SelectBuilder {
-	sb.groupByCols = EscapeAll(col...)
+	sb.groupByCols = col
 	return sb
 }
 
 // OrderBy sets columns of ORDER BY in SELECT.
 func (sb *SelectBuilder) OrderBy(col ...string) *SelectBuilder {
-	sb.orderByCols = EscapeAll(col...)
+	sb.orderByCols = col
 	return sb
 }
 
@@ -154,13 +154,13 @@ func (sb *SelectBuilder) Offset(offset int) *SelectBuilder {
 
 // As returns an AS expression.
 func (sb *SelectBuilder) As(name, alias string) string {
-	return fmt.Sprintf("%v AS %v", name, Escape(alias))
+	return fmt.Sprintf("%s AS %s", name, alias)
 }
 
 // BuilderAs returns an AS expression wrapping a complex SQL.
 // According to SQL syntax, SQL built by builder is surrounded by parens.
 func (sb *SelectBuilder) BuilderAs(builder Builder, alias string) string {
-	return fmt.Sprintf("(%v) AS %v", sb.Var(builder), Escape(alias))
+	return fmt.Sprintf("(%s) AS %s", sb.Var(builder), alias)
 }
 
 // String returns the compiled SELECT string.
diff --git a/select_test.go b/select_test.go
index b7304c2..a9b7402 100644
--- a/select_test.go
+++ b/select_test.go
@@ -93,7 +93,6 @@ func ExampleSelectBuilder_join() {
 }
 
 func ExampleSelectBuilder_limit_offset() {
-
 	sb := NewSelectBuilder()
 	sb.Select("*")
 	sb.From("user")
@@ -153,3 +152,21 @@ func ExampleSelectBuilder_limit_offset() {
 	// SELECT * FROM user LIMIT 0
 	// SELECT * FROM user LIMIT 0
 }
+
+func ExampleSelectBuilder_varInCols() {
+	// Column name may contain some characters, e.g. the $ sign, which have special meanings in builders.
+	// It's recommended to call Escape() or EscapeAll() to escape the name.
+
+	sb := NewSelectBuilder()
+	v := sb.Var("foo")
+	sb.Select(Escape("colHasA$Sign"), v)
+	sb.From("table")
+
+	sql, args := sb.Build()
+	fmt.Println(sql)
+	fmt.Println(args)
+
+	// Output:
+	// SELECT colHasA$Sign, ? FROM table
+	// [foo]
+}
diff --git a/update.go b/update.go
index f499803..9121b85 100644
--- a/update.go
+++ b/update.go
@@ -61,43 +61,43 @@ func (ub *UpdateBuilder) Where(andExpr ...string) *UpdateBuilder {
 
 // Assign represents SET "field = value" in UPDATE.
 func (ub *UpdateBuilder) Assign(field string, value interface{}) string {
-	return fmt.Sprintf("%v = %v", Escape(field), ub.args.Add(value))
+	return fmt.Sprintf("%s = %s", Escape(field), ub.args.Add(value))
 }
 
 // Incr represents SET "field = field + 1" in UPDATE.
 func (ub *UpdateBuilder) Incr(field string) string {
 	f := Escape(field)
-	return fmt.Sprintf("%v = %v + 1", f, f)
+	return fmt.Sprintf("%s = %s + 1", f, f)
 }
 
 // Decr represents SET "field = field - 1" in UPDATE.
 func (ub *UpdateBuilder) Decr(field string) string {
 	f := Escape(field)
-	return fmt.Sprintf("%v = %v - 1", f, f)
+	return fmt.Sprintf("%s = %s - 1", f, f)
 }
 
 // Add represents SET "field = field + value" in UPDATE.
 func (ub *UpdateBuilder) Add(field string, value interface{}) string {
 	f := Escape(field)
-	return fmt.Sprintf("%v = %v + %v", f, f, ub.args.Add(value))
+	return fmt.Sprintf("%s = %s + %s", f, f, ub.args.Add(value))
 }
 
 // Sub represents SET "field = field - value" in UPDATE.
 func (ub *UpdateBuilder) Sub(field string, value interface{}) string {
 	f := Escape(field)
-	return fmt.Sprintf("%v = %v - %v", f, f, ub.args.Add(value))
+	return fmt.Sprintf("%s = %s - %s", f, f, ub.args.Add(value))
 }
 
 // Mul represents SET "field = field * value" in UPDATE.
 func (ub *UpdateBuilder) Mul(field string, value interface{}) string {
 	f := Escape(field)
-	return fmt.Sprintf("%v = %v * %v", f, f, ub.args.Add(value))
+	return fmt.Sprintf("%s = %s * %s", f, f, ub.args.Add(value))
 }
 
 // Div represents SET "field = field / value" in UPDATE.
 func (ub *UpdateBuilder) Div(field string, value interface{}) string {
 	f := Escape(field)
-	return fmt.Sprintf("%v = %v / %v", f, f, ub.args.Add(value))
+	return fmt.Sprintf("%s = %s / %s", f, f, ub.args.Add(value))
 }
 
 // String returns the compiled UPDATE string.