在两个MySQL表的列上获取MAX()？
使用GREATEST()以找到最大。让我们首先创建一个表-
mysql> create table DemoTable1 ( Number int );
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable1 values(80); mysql> insert into DemoTable1 values(229); mysql> insert into DemoTable1 values(575);
使用select语句显示表中的所有记录-
mysql> select *from DemoTable1;
输出结果
+--------+ | Number | +--------+ | 80 | | 229 | | 575 | +--------+ 3 rows in set (0.00 sec)
以下是创建第二个表的查询-
mysql> create table DemoTable2 ( Number int );
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable2 values(485); mysql> insert into DemoTable2 values(10); mysql> insert into DemoTable2 values(475);
使用select语句显示表中的所有记录-
mysql> select *from DemoTable2;
输出结果
+--------+ | Number | +--------+ | 485 | | 10 | | 475 | +--------+ 3 rows in set (0.00 sec)
以下是获取MAX()两个表中的列的查询-
mysql> select greatest((select max(Number) from DemoTable1),(select max(Number) from DemoTable2));
输出结果
+-----------------------------------------------------------------------------------------+ | greatest((select max(Number) from DemoTable1),(select max(Number) from DemoTable2)) | +-----------------------------------------------------------------------------------------+ | 575 | +-----------------------------------------------------------------------------------------+ 1 row in set (0.00 sec)