mysql - SQL多选case语句

Question

我可以这样做:

select 
case a.x > 1 then a.bananas else a.pajamas end 
from my_table a;

但是当我尝试像这样调整它时:

select 
case a.x > 1 then a.bananas, a.pajamas else a.strawberries, a.peaches end 
from my_table;

它说我的语法有错误。如何根据条件选择列的任意不同子集？

Answer 1

您需要为每一列单独的CASE:

SELECT
    case a.x > 1 then a.bananas else a.pajamas end as bananas_or_pajamas,
    case a.x > 1 then a.strawberries else a.peaches end as strawberries_or_peaches,
    ....