我们可以在单个MySQL查询中更新具有最高ID的行吗？
是的，我们可以做到。让我们首先创建一个表-
mysql> create table DemoTable ( ID int, GameScore int );
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable values(15,848747); mysql> insert into DemoTable values(13,909049); mysql> insert into DemoTable values(34,98474646); mysql> insert into DemoTable values(31,948474);
使用select语句显示表中的所有记录-
mysql> select *from DemoTable;
输出结果
+------+-----------+ | ID | GameScore | +------+-----------+ | 15 | 848747 | | 13 | 909049 | | 34 | 98474646 | | 31 | 948474 | +------+-----------+ 4 rows in set (0.00 sec)
以下是在单个查询中更新具有最高ID的行的查询-
mysql> update DemoTable set GameScore=GameScore+10 ORDER BY ID DESC LIMIT 1; Rows matched : 1 Changed : 1 Warnings : 0
让我们再次检查表记录-
mysql> select *from DemoTable;
输出结果
+------+-----------+ | ID | GameScore | +------+-----------+ | 15 | 848747 | | 13 | 909049 | | 34 | 98474656 | | 31 | 948474 | +------+-----------+ 4 rows in set (0.00 sec)