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从具有MySQL中对应的重复列值的列中选择最小行值

2024-05-01 08:24:08 370

让我们首先创建一个表-

mysql> create table DemoTable1875
   (
   Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   Class varchar(20),
   Amount int
   );

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable1875(Class,Amount) values('X',750);
mysql> insert into DemoTable1875(Class,Amount) values('X',140);
mysql> insert into DemoTable1875(Class,Amount) values('X',450);
mysql> insert into DemoTable1875(Class,Amount) values('Y',6780);
mysql> insert into DemoTable1875(Class,Amount) values('Z',1350);
mysql> insert into DemoTable1875(Class,Amount) values('Z',2050);

使用select语句显示表中的所有记录-

mysql> select * from DemoTable1875;

这将产生以下输出-

+----+-------+--------+
| Id | Class | Amount |
+----+-------+--------+
|  1 | X     |    750 |
|  2 | X     |    140 |
|  3 | X     |    450 |
|  4 | Y     |    6780 |
|  5 | Z     |    1350 |
|  6 | Z     |    2050 |
+----+-------+--------+
6 rows in set (0.00 sec)

以下是查询以选择行

mysql> select Class,Min(Amount) from DemoTable1875 group by Class;

这将产生以下输出-

+-------+-------------+
| Class | Min(Amount) |
+-------+-------------+
| X     |         140 |
| Y     |        6780 |
| Z     |        1350 |
+-------+-------------+
3 rows in set (0.00 sec)

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从具有MySQL中对应的重复列值的列中选择最小行值

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