MySQL 根据条件按"ENUM"类型值进行排序
mysqlmysqli database更新于 2024/2/11 22:44:00
为此，请使用 ORDER BY CASE 语句。让我们首先创建一个表，其中有 ENUM 类型的列 −
mysql> create table DemoTable1461
-> (
-> DeckOfCards ENUM('K','J','A','Q')
-> );
Query OK, 0 rows affected (0.64 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable1461 values('K');
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable1461 values('A');
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable1461 values('J');
Query OK, 1 row affected (0.44 sec)
mysql> insert into DemoTable1461 values('Q');
Query OK, 1 row affected (0.13 sec)
使用 select 语句显示表中的所有记录 −
mysql> select * from DemoTable1461;
这将产生以下输出 −
+-------------+ | DeckOfCards | +-------------+ | K | | A | | J | | Q | +-------------+ 4 rows in set (0.00 sec)
以下是按 ENUM 类型值排序的查询 −
mysql> select * from DemoTable1461 -> order by -> case DeckOfCards when 'A' then 100 -> when 'K' then 101 -> when 'Q' then 102 -> else 103 -> end;
这将产生以下输出 −
+-------------+ | DeckOfCards | +-------------+ | A | | K | | Q | | J | +-------------+ 4 rows in set (0.00 sec)
