Question

我想按IN条件传递顺序获取记录。

从表中选择*，其中id为（6,3,7,1）; 将行返回为

id   name
1     abc
3     xy
6     ab
7     ac

但是我希望以与Oracle中的条件传递的ID相同的顺序显示记录

id   name
6     ab
3     xy
7     ac
1     abc

请帮助我以与oracle中的条件ID相同的顺序获取记录。 IN条件中的值可能会动态变化。

Answer 1

您可以使用case子句中的order by语句或使用join来执行此操作。

select *
from table 
where id in(6,3,7,1)
order by (case id when 6 then 1 when 3 then 2 when 7 then 3 when 1 then 4 end);

或者：

with ids as (
      select 6 as id, 1 as ordering from dual union all
      select 3 as id, 2 as ordering from dual union all
      select 7 as id, 3 as ordering from dual union all
      select 1 as id, 4 as ordering from dual
     )
select *
from table t join
     ids
     on t.ids = ids.id
order by ids.ordering;

请注意，在这种情况下，您不需要in，因为join会进行过滤。

Answer 2

你可以使用技巧

select * from table where id in(6,3,7,1) order by case when id = 6 then 1
                                                            id = 3 then 2
                                                            id = 7 then 3
                                                            id = 1 then 4
                                                   end

按照oracle中IN条件传递的顺序获取记录

2 个答案: