如何在单个MySQL查询中找到最小值和最大值？
要在单个查询中找到最小值和最大值，请使用MySQLUNION。让我们首先创建一个表-
mysql> create table DemoTable ( Price int );
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable values(88); mysql> insert into DemoTable values(100); mysql> insert into DemoTable values(98); mysql> insert into DemoTable values(120);
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-
+-------+ | Price | +-------+ | 88 | | 100 | | 98 | | 120 | +-------+ 4 rows in set (0.00 sec)
以下是在单个MySQL查询中查找最小值和最大值的查询-
mysql> select Price from DemoTable where Price=(select min(Price) from DemoTable) UNION select Price from DemoTable where Price=(select max(Price) from DemoTable);
这将产生以下输出-
+-------+ | Price | +-------+ | 88 | | 120 | +-------+ 2 rows in set (0.00 sec)