MySQL ORDER BY 带有自定义字段值
mysqlmysqli database更新于 2023/10/16 7:27:00
要设置自定义字段值，请使用 FIND_IN_SET()。让我们首先创建一个表 −
mysql> create table DemoTable677( UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY, UserStatus text ); Query OK, 0 rows affected (1.07 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable677(UserStatus) values('BUSY');
Query OK, 1 row affected (0.23 sec)
mysql> insert into DemoTable677(UserStatus) values('AT WORK');
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable677(UserStatus) values('OFFLINE');
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable677(UserStatus) values('BLOCKED');
Query OK, 1 row affected (0.17 sec)
使用 select 语句显示表中的所有记录 −
mysql> select *from DemoTable677;
这将产生以下输出 −
+--------+------------+ | UserId | UserStatus | +--------+------------+ | 1 | BUSY | | 2 | AT WORK | | 3 | OFFLINE | | 4 | BLOCKED | +--------+------------+ 4 rows in set (0.00 sec)
以下是使用自定义字段值的 ORDER BY 查询 −
mysql> select *from DemoTable677 ORDER BY FIND_IN_SET(UserStatus, 'BLOCKED,AT WORK,OFFLINE,BUSY');
这将产生以下输出 −
+--------+------------+ | UserId | UserStatus | +--------+------------+ | 4 | BLOCKED | | 2 | AT WORK | | 3 | OFFLINE | | 1 | BUSY | +--------+------------+ 4 rows in set (0.03 sec)
