有条件的SQL语句在where子句中

select * 
from someTable 
where currencyid = @currencyid --CaseA 
    or (Currencyid in (8,11) or (@Currencyid = 0)) --CaseB

如何修改这样的查询，以便在@currencyid = 0条件将被设置为只有CaseB而其他设置为CaseA时？有条件的SQL语句在where子句中

例如：如果@currencyid = 0然后结束查询被执行是

select * 
from someTable 
where currencyid = (Currencyid in (8,11) or (@Currencyid = 0))

@currencyid = 8如果然后结束查询被执行是

select * 
from someTable 
where currencyid = @currencyid

来源

2016-03-03 Isaac Lem

嗯？你想要一个条件，说'@Currencyid = 0'被应用，但只有在你知道'@ CurrencyId'不能为零的情况下？这有什么意义？ –

@Damien_The_Unbeliever：对不起造成混淆。我已经更新了这个问题，谢谢 –

SELECT * 
FROM someTable 
WHERE (currencyid = @Currencyid AND @Currencyid != 0) 
    OR (Currencyid IN (8, 11) AND @Currencyid = 0) 
--OPTION(RECOMPILE)

来源

2016-03-03 09:25:54 Devart

有条件的SQL语句在where子句中

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