返回 MySQL 记录中的最大值
mysqlmysqli database
首先我们创建一个表 −
mysql> create table DemoTable1449 -> ( -> PlayerId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> PlayerScore int -> ); Query OK, 0 rows affected (0.69 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable1449(PlayerScore) values(1040); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable1449(PlayerScore) values(1450); Query OK, 1 row affected (0.34 sec) mysql> insert into DemoTable1449(PlayerScore) values(1890); Query OK, 1 row affected (0.72 sec) mysql> insert into DemoTable1449(PlayerScore) values(1650); Query OK, 1 row affected (0.25 sec)
使用 select 语句显示表中的所有记录 −
mysql> select * from DemoTable1449;
这将产生以下输出 −
+----------+-------------+ | PlayerId | PlayerScore | +----------+-------------+ | 1 | 1040 | | 2 | 1450 | | 3 | 1890 | | 4 | 1650 | +----------+-------------+ 4 rows in set (0.00 sec)
以下是从记录中返回最大值的查询 −
mysql> select PlayerId,PlayerScore from DemoTable1449 -> where PlayerScore=( select max(PlayerScore) PlayerScore from DemoTable1449);
这将产生以下输出 −
+----------+-------------+ | PlayerId | PlayerScore | +----------+-------------+ | 3 | 1890 | +----------+-------------+ 1 row in set (0.00 sec)
