sql-server-2008 - 如何在Sql的Where子句中设置If条件

Question

我想显示一个具有多个条件的条件，但如果任何条件为空或没有任何值，则比如何在 where 子句中设置。例子：

where
SR.fk_Designation_ID = @pk_Designation_ID
and SR.fk_SeniorityCategory_ID = @pk_SeniorityCategory_ID
and SR.IsCurrent_Appointment = 1 and SR.fk_SeparationType_ID is null
order by Senority_Joining_For_Order,E.Date_Of_Birth

这里 if @pk_SeniorityCategory_IDis nullthan 我不想在子句中包含and SR.fk_SeniorityCategory_ID = @pk_SeniorityCategory_ID条件。where

Answer 1

尝试这个：

WHERE
SR.fk_Designation_ID = @pk_Designation_ID
AND (@pk_SeniorityCategory_ID IS NULL 
     OR 
     SR.fk_SeniorityCategory_ID = @pk_SeniorityCategory_ID)
AND SR.IsCurrent_Appointment = 1 AND SR.fk_SeparationType_ID IS NULL
ORDER BY Senority_Joining_For_Order,E.Date_Of_Birth