Question

我在db中有一列包含以下值之一：1 2 3 4

我想以这种方式按照这个值订购：

mix between 1 & 3 then 2 then 4.

表：服务
列： name，service_type
服务类型可以是1 2 3 4，我想显示订单服务1和3然后2然后4

任何想法??
亲切的问候

Answer 1

也许是这样的，使用case/when：

create table t7
(   name varchar(20) not null,
    aNum int not null
);
insert t7 (name,aNum) values ('a',2),('z',3),('n',3),('q',4),('t',1),
('q',2),('w',3),('e',3),('r',4),('t',1),('y',2);

select name,aNum, 
CASE WHEN aNum in (1,3) THEN 1 else 2 end as theOrder 
from t7 
order by theOrder;
+------+------+----------+
| name | aNum | theOrder |
+------+------+----------+
| z    |    3 |        1 |
| n    |    3 |        1 |
| t    |    1 |        1 |
| t    |    1 |        1 |
| w    |    3 |        1 |
| e    |    3 |        1 |
| a    |    2 |        2 |
| r    |    4 |        2 |
| q    |    2 |        2 |
| q    |    4 |        2 |
| y    |    2 |        2 |
+------+------+----------+

如果mix不够特殊，请转到

select name,aNum from
( select name,aNum from t7 where aNum in (1,3) order by rand()) x1
union all
select name,aNum from
( select name,aNum from t7 where aNum in (2,4) order by rand()) x2

Mysql按混合值排序然后是其他值

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