SQL case 语句总是返回 false 或 null

Question

这是一个更大查询的一部分，但我发现这个特定部分总是返回 false？相同的表和字段比较不同的记录。我正在尝试使用单个 case 语句检查两部分条件。任何意见表示赞赏。

CASE WHEN (CN IN ('C10302','C10002','C10602','C10702','C11002','C14002','C14082')
AND Mark NOT IN ('D-','D','D+','F','NC')
AND CN IN ('C10301','C10001','C10601','C10701','C11001','C14001','C14081')
AND Mark IN ('D-','D','D+','F','NC')) THEN 1 
ELSE 0 END AS C2

我认为它是在尝试比较相同的记录

Answer 1

我相信你正在寻找这个

所以你得到两个条件，只有一个必须为真才能得到 1

CASE WHEN ((CN IN ('C10302','C10002','C10602','C10702','C11002','C14002','C14082')
AND Mark NOT IN ('D-','D','D+','F','NC'))
OR ( CN IN ('C10301','C10001','C10601','C10701','C11001','C14001','C14081')
AND Mark IN ('D-','D','D+','F','NC'))) THEN 1 
ELSE 0 END AS C2