diff --git a/chain.go b/chain.go
index 27153be..66f99dc 100644
--- a/chain.go
+++ b/chain.go
@@ -197,6 +197,7 @@ func (this *Query) Clean() *Query {
 	this.save_data = this.save_data[0:0]
 	this.upd_field = this.upd_field[0:0]
 	this.having = ""
+	this.alias = ""
 	return this
 }
 
@@ -266,6 +267,11 @@ func (this *Query) GetTableInfo(table string) (map[string]interface{}, error) {
 	}, nil
 }
 
+// 返回表名
+func (this *Query) GetTableName(table string) string {
+	return getTableName(this.dbname, table)
+}
+
 // 构造子查询
 func (this *Query) BuildSelectSql() (map[string]interface{}, error) {
 	if this.dbname == "" && this.table == "" {
diff --git a/transaction_chain.go b/transaction_chain.go
index 2cc5f2d..11d273a 100644
--- a/transaction_chain.go
+++ b/transaction_chain.go
@@ -197,9 +197,15 @@ func (this *TxQuery) Clean() *TxQuery {
 	this.save_data = this.save_data[0:0]
 	this.upd_field = this.upd_field[0:0]
 	this.having = ""
+	this.alias = ""
 	return this
 }
 
+// 返回表名
+func (this *TxQuery) GetTableName(table string) string {
+	return getTableName(this.dbname, table)
+}
+
 // 构造子查询
 func (this *TxQuery) BuildSelectSql() (map[string]interface{}, error) {
 	if this.dbname == "" && this.table == "" {