1.DELETE基本使用

(1)删除指定的用户 DELETE FROM users where uname=‘hxf’; (2)删除所有记录 DELETE FROM USERS;#### 2.DELETE关联删除 (3)关联删除 DELETE a,b FROM emp a,dept b where a.deptno=b.deptno and a.detpno=1#### 3.注入删除 注入删除 DELETE FROM users where uname=‘hxf’; DELETE FROM users where uname=‘ ’ or ‘1’=‘1’;