MySQL查询通过ID选择不同的顺序
为此，请使用ORDERBYMAX()。让我们首先创建一个表-
mysql> create table DemoTable -> ( -> Id int, -> Name varchar(100) -> );
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable values(10,'John'); mysql> insert into DemoTable values(10,'John'); mysql> insert into DemoTable values(20,'Sam'); mysql> insert into DemoTable values(20,'Sam'); mysql> insert into DemoTable values(30,'David'); mysql> insert into DemoTable values(30,'David');
使用select语句显示表中的所有记录-
mysql> select *from DemoTable;
输出结果
这将产生以下输出-
+------+-------+ | Id | Name | +------+-------+ | 10 | John | | 10 | John | | 20 | Sam | | 20 | Sam | | 30 | David | | 30 | David | +------+-------+ 6 rows in set (0.00 sec)
以下是通过ID选择不同订单的查询-
mysql> select Name from DemoTable -> group by Name -> order by max(Id) DESC -> limit 2;
输出结果
这将产生以下输出-
+-------+ | Name | +-------+ | David | | Sam | +-------+ 2 rows in set (0.06 sec)