Question

我正在尝试使用Case in Update查询，它给出了一个错误，即case附近有一个不正确的语法。我不确定在哪里？！这是在SQL 2005

中

我将日期发送到存储过程。如果发送的日期是'01 / 01/1905'，则必须保存null，否则输入的实际日期。我真的不确定这句话有什么问题。

Update Manifest set Notes = @Notes, IsCustom = @IsCustom,
CASE WHEN @ProofSent = CONVERT(datetime, '01/01/1905') THEN NULL ELSE @ProofSent END,
CASE WHEN @ProofApproved = CONVERT(datetime, '02/01/1905') THEN NULL ELSE @ProofApproved END

提前致谢！

Answer 1

您尚未声明应将其设置为哪个列：

Update Manifest set Notes = @Notes, IsCustom = @IsCustom,
    ProofSent = CASE WHEN @ProofSent = CONVERT(datetime, '01/01/1905') THEN NULL ELSE @ProofSent END,
    ProofApproved = CASE WHEN @ProofApproved = CONVERT(datetime, '02/01/1905') THEN NULL ELSE @ProofApproved END

Answer 2

必须是这样的：

Update Manifest set Notes = @Notes, IsCustom = @IsCustom,
Column1 = 
    CASE WHEN @ProofSent = CONVERT(datetime, '01/01/1905') THEN NULL 
    ELSE @ProofSent END,
Column2=
    CASE WHEN @ProofApproved = CONVERT(datetime, '02/01/1905') THEN NULL 
    ELSE @ProofApproved END

在更新查询中使用Case

2 个答案: