如何在WHERE子句中使用CASE

Question

select 
    SUBSTRING(ackey,1,2) + '-' + SUBSTRING(ackey, 3,3) + '-' + SUBSTRING(ackey,8,6) 
from 
    tHE_Move 
where case 
     when acDocType in ('1900', '1910', '1920', '1930') then acWayOfSale <> 'E' 
     when acDocType in ('1950', '1960') then acWayOfSale <> 'U' 

我可以這樣做嗎？

我解決了這個有：

select 
    SUBSTRING(ackey,1,2) + '-' + SUBSTRING(ackey, 3,3) + '-' + SUBSTRING(ackey,8,6) 
from 
    tHE_Move 
where 
    (case when acDocType in ('1900', '1910', '1920', '1930') then acWayOfSale end <> 'E' 
    or 
    case when acDocType in ('1950','1960') then acWayOfSale end <> 'U') 

但我有興趣，如果這隻能在一個情況下得到解決？

Answer 1

，你可以：

where acWayOfSale <> case when acDocType in ('1900', '1910', '1920', '1930') then 'E' 
        when acDocType in ('1950', '1960') then 'U' 
        else ... 
        end 

（或課程的創建/修改表與acDocType值與期望的性格和JOIN吧）

Answer 2

你在正確的軌道上，但CASE返回一個表達式，並在tsql中不能返回布爾值..你真正想要做的是使用AND和OR的組合。在你的情況下：

where (acDocType in ('1900', '1910', '1920', '1930') and acWayOfSale <> 'E') 
or (acDocType in ('1950','1960') and acWayOfSale <> 'U')