Transact-sql中的条件运算符

Question

有没有办法做到这一点,例如在Transact-sql中使用某种条件运算符？

IF @ParentBinaryAssetStructureId = -1
BEGIN
    SET @ParentBinaryAssetStructureId = NULL
END

UPDATE  BinaryAssets.BinaryAssetStructures 
SET     ParentBinaryAssetStructureId = @ParentBinaryAssetStructureId
WHERE   BinaryAssetStructureId = @OriginalBinaryAssetStructureId

Answer 1

使用NULLIF()

UPDATE  BinaryAssets.BinaryAssetStructures 
SET     ParentBinaryAssetStructureId = NULLIF(@ParentBinaryAssetStructureId,-1)
WHERE   BinaryAssetStructureId = @OriginalBinaryAssetStructureId