我的SQL Case Query出了什么问题

Question

想知道下面我的查询有什么问题？

case
b.transaction_id,
when b.total_discount<0 then (ABS(b.total_discount)/(b.total_revenue + ABS(b.total_discount)) else '0' end as pct_discount_off
from transaction b

出现错误消息。

Msg 156, Level 15, State 1, Line 27
Incorrect syntax near the keyword 'end'

Answer 1

您错过了closing bracket ')'：

case
b.transaction_id 
when b.total_discount<0 
then (ABS(b.total_discount)/(b.total_revenue + ABS(b.total_discount))) 
else '0' end as pct_discount_off

Answer 2

我认为你在寻找的是

SELECT case 
when b.total_discount < 0 then (ABS(b.total_discount)/(b.total_revenue + ABS(b.total_discount))) 
else '0' end as pct_discount_off
from [transaction] b

Answer 3

使用

select case b.transaction_id when b.total_discount<0 then (ABS(b.total_discount)/(b.total_revenue + ABS(b.total_discount)) else '0' end as pct_discount_off from transaction b