MySQL的Update的使用,该如何处理
MySQL的Update的使用
MySQL的更新语句update中可以用子查询吗?
update score set 姓名='王五' where 总分=(select min(总分) from score);
我这样用为什么出错?
/*******************
CREATE TABLE IF NOT EXISTS score(
学号 BIGINT UNSIGNED,
姓名 varchar(10),
数学 TINYINT UNSIGNED,
英语 TINYINT UNSIGNED,
物理 TINYINT UNSIGNED,
计算机综合 TINYINT UNSIGNED,
总分 int UNSIGNED
);
已确保各字段数据正确插入
********************/
求教!
------解决方案--------------------
这样试试,
update score set …… where 总分 in ( SELECT * FROM (SELECT min(总分) AS 总分 FROM score)t)
------解决方案--------------------
- SQL code
update score set 姓名='王五' order by 总分 asc limit 1; <br><font color="#e78608">------解决方案--------------------</font><br> mysql中 update的表 不能出现在第一层的子查询中,参考4楼的方法让表绕过第一层子查询 <br><font color="#e78608">------解决方案--------------------</font><br>试一下不就知道了<br>
- SQL code
UPDATE score SET 数学=(SELECT 数学 FROM (SELECT MIN(数学) AS 数学 FROM score )t)-4 WHERE 姓名='王五'; <div class="clear"> </div>

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