插入,更新,删除
- –向表中插入记录
INSERT tbl_name VALUE|VALUES(值,·,·,)
INSERT cms_news VALUES(1,"This is Title","内容",'time'···)
INSERT user(usename) VALUES('queen');
- –更新用户名为4位的用户,让其已有年龄 减3
UPDATE cms_user SET age=age-3 WHERE username LIKE '____'; #4个下划线
- –更新前3条记录,让已有年龄+10
UPDATE cms_user SET age=age+10 LIMIT 3;
- –按照id降序排列,更新前3条
UPDATE cms_user SET age=age+10 ORDER BY id DESC LIMIT 3;
- –删除用户性别为男的用户,按照年龄降序排列,删除前一条记录
DELETE FROM cms_user WHERE sex='男' ORDER BY age DESC LIMIT 1;