1、delete from t1 where 条件
2、delete t1 from t1 where 条件
3、delete t1 from t1,t2 where 条件
4、delete t1,t2 from t1,t2 where 条件
前3个是可行的,第4个不可行。
1、delete from t1 where 条件
2、delete t1 from t1 where 条件
3、delete t1 from t1,t2 where 条件
4、delete t1,t2 from t1,t2 where 条件
前3个是可行的,第4个不可行。