如何在单个 MySQL 查询中使用 GROUP BY 来按字段排序?
mysqlmysqli database
为此，我们首先创建一个表 −
mysql> create table DemoTable ( Message text ); Query OK, 0 rows affected (1.15 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable values('Good');
Query OK, 1 row affected (0.43 sec)
mysql> insert into DemoTable values('Bye');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable values('Awesome');
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable values('Bye');
Query OK, 1 row affected (0.08 sec)
mysql> insert into DemoTable values('Good');
Query OK, 1 row affected (0.23 sec)
mysql> insert into DemoTable values('Amazing');
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable values('Awesome');
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable values('Bye');
Query OK, 1 row affected (0.12 sec)
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 −
+---------+ | Message | +---------+ | Good | | Bye | | Awesome | | Bye | | Good | | Amazing | | Awesome | | Bye | +---------+ 8 rows in set (0.00 sec)
以下是在单个 MySQL 查询中对 ORDER BY FIELD 和 GROUP BY 进行查询 −
mysql> select *from DemoTable group by Message order by field(Message,'Amazing','Awesome','Good','Bye');
这将产生以下输出 −
+---------+ | Message | +---------+ | Amazing | | Awesome | | Good | | Bye | +---------+ 4 rows in set (0.04 sec)
