使用子查询从 MySQL 表获取第二大成绩?


我们首先创建一个表 -

mysql> create table DemoTable(
   Marks int
);
Query OK, 0 rows affected (1.34 sec)

使用 insert 命令向表中插入一些记录 -

mysql> insert into DemoTable values(78);
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable values(88);
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable values(67);
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable values(76);
Query OK, 1 row affected (0.25 sec)
mysql> insert into DemoTable values(98);
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable values(86);
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable values(89);
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable values(99);
Query OK, 1 row affected (0.12 sec)

使用 select 语句从表中显示所有记录 -

mysql> select *from DemoTable;

这将产生以下输出 -

+-------+
| Marks |
+-------+
| 78    |
| 88    |
| 67    |
| 76    |
| 98    |
| 86    |
| 89    |
| 99    |
+-------+
8 rows in set (0.00 sec)

以下是从 MySQL 表中获取第二大成绩的查询 -

mysql> select Marks from DemoTable
where Marks=(select MAX(Marks) from DemoTable where Marks < (select MAX(Marks) from DemoTable));

这将产生以下输出 -

+-------+
| Marks |
+-------+
| 98    |
+-------+
1 row in set (0.03 sec)

更新日期: 2019 年 9 月 27 日

274 次浏览

开启您的 职业生涯

完成课程获得认证

开始
Advertisements