Question

我无法理解为什么这会给我错误"Cannot construct data type date, some of the arguments have values which are not valid."

这是我的疑问：

SELECT      TOP 1 pc.Comment AS [Comment], pc.[Month] AS [Month], pc.[Year] AS [Year]
    FROM        PECCS.dbo.ProjectComment pc
    WHERE       pc.ProjectId = 11501 AND
                pc.Type = 'OYEO' AND
                (DATEFROMPARTS(pc.[Year], pc.[Month], 1) <= DATEFROMPARTS(2017, 12, 1)) AND
                pc.ResourceCategoryID = 1
    ORDER BY    pc.[Year] DESC, pc.[Month] DESC

我传递的参数有效。我认为问题是表中有记录，其中Month = 0.我相信这会导致问题：(DATEFROMPARTS(pc.[Year], pc.[Month], 1)

Answer 1

数据库中的[Month]是INT列，还是带有月份名称的VARCHAR？使用类似的列来测试它，它给了我相同的错误，直到我将[Month]更改为不同的列[Year of Year]，即INT。然后它工作正常。

Answer 2

我通过将0的月份转换为默认月值来解决问题。在这种情况下，我选择了12：

SELECT      TOP 1 pc.Comment AS [Comment], pc.[Month] AS [Month], pc.[Year] AS [Year]
    FROM        PECCS.dbo.ProjectComment pc
    WHERE       pc.ProjectId = 11501 AND
                pc.Type = 'OYEO' AND
                (DATEFROMPARTS(pc.Year, CASE WHEN pc.[Month] = 0  THEN 12 ELSE pc.[Month] END, 1) <= DATEFROMPARTS(@Year, @Month, 1)) AND
                pc.ResourceCategoryID = 1
    ORDER BY    pc.[Year] DESC, pc.[Month] DESC

构造日期时出错

2 个答案: