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MySQL查询从重复的列值中获取最大对应值

2024-04-21 20:38:03 424

让我们首先创建一个表-

mysql> create table DemoTable(
   ProductName varchar(100),
   ProductPrice int
);

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable values('Product-1',56);
mysql> insert into DemoTable values('Product-2',78);
mysql> insert into DemoTable values('Product-1',88);
mysql> insert into DemoTable values('Product-2',86);
mysql> insert into DemoTable values('Product-1',45);
mysql> insert into DemoTable values('Product-3',90);
mysql> insert into DemoTable values('Product-2',102);
mysql> insert into DemoTable values('Product-3',59);

使用select语句显示表中的所有记录-

mysql> select *from DemoTable;

这将产生以下输出-

+-------------+--------------+
| ProductName | ProductPrice |
+-------------+--------------+
| Product-1   | 56           |
| Product-2   | 78           |
| Product-1   | 88           |
| Product-2   | 86           |
| Product-1   | 45           |
| Product-3   | 90           |
| Product-2   | 102          |
| Product-3   | 59           |
+-------------+--------------+
8 rows in set (0.00 sec)

以下是从重复的列值中获取最大对应值的查询。在这里，我们找到了重复列（例如Product-1，Product-2等）的最大ProductPrice-

mysql> select ProductName,MAX(ProductPrice) from DemoTable group by ProductName;

这将产生以下输出-

+-------------+-------------------+
| ProductName | MAX(ProductPrice) |
+-------------+-------------------+
| Product-1   | 88                |
| Product-2   | 102               |
| Product-3   | 90                |
+-------------+-------------------+
3 rows in set (0.00 sec)

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MySQL查询从重复的列值中获取最大对应值

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