MySQL ORDER BY'ENUM'类型值基于条件
为此，请使用ORDERBYCASE语句。让我们首先创建一个表，其中有ENUM类型的列-
create table DemoTable1461
-> (
-> DeckOfCards ENUM('K','J','A','Q')
-> );使用插入命令在表中插入一些记录-
insert into DemoTable1461 values('K');
insert into DemoTable1461 values('A');
insert into DemoTable1461 values('J');
insert into DemoTable1461 values('Q');使用select语句显示表中的所有记录-
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-
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)