Oracle 具有多列的Order By子句的CASE语句

我希望ORDERBY语句根据条件更改列排序顺序

例如，如果有A、B、C、D列，并且条件值作为参数输入（pType）

• 如果pType=1，则排序为A、B、C、D

• 如果pType=2，则排序为B、C、D、A

• 如果pType=3 C、A、B、D

当语句按如下方式应用和使用时，按情况排序。 发生了一个错误

Order by
Case
when pType = 1 then A, B, C, D
when pType = 2 then B, C, D, A
when pType = 3 then C, A, B, D

我应该如何使用它

谢谢你的帮助。

看看这是否有效

with t1_ as
(
  select 1 as ptype, 10 as a, 5  as b, 20 as c from dual union all
  select 1 as ptype, 6  as a, 10 as b, 21 as c from dual union all
  
  select 2 as ptype, 20 as a, 2 as b, 16 as c from dual union all
  select 2 as ptype, 100 as a, 1 as b, 90 as c from dual
)

select 
* 
from t1_
order by
case when ptype = 1 then a end asc,
case when ptype = 1 then b end asc,
case when ptype = 1 then c end asc,

case when ptype = 2 then b end asc,
case when ptype = 2 then c end asc,
case when ptype = 2 then a end asc

FIDLE url供参考

您可以使用以下功能：

ORDER BY DECODE(pType, 1, A, 2, B, 3, C),
         DECODE(pType, 1, B, 2, C, 3, A),
         DECODE(pType, 1, C, 2, D, 3, B),
         DECODE(pType, 1, D, 2, A, 3, D)