Question

我有以下查询使用日期变量，该变量在存储过程中生成：

DECLARE @sp_Date DATETIME
SET @sp_Date = DateAdd(m, -6, GETDATE())

SELECT DISTINCT pat.PublicationID
     FROM PubAdvTransData AS pat 
     INNER JOIN PubAdvertiser AS pa ON pat.AdvTransID = pa.AdvTransID
     WHERE (pat.LastAdDate > @sp_Date) AND (pa.AdvertiserID = 12345))

问题是@sp_Date值似乎被忽略了，我想知道为什么？我是否错误地定义或使用了它？

sql microsoft sql-server-2008

用户错误...

谢谢，R。

Answer 1

您的语法很好，它将返回LastAdDate在过去6个月内的行;

select cast('01-jan-1970' as datetime) as LastAdDate into #PubAdvTransData 
    union select GETDATE()
    union select NULL
    union select '01-feb-2010'

DECLARE @sp_Date DATETIME = DateAdd(m, -6, GETDATE())

SELECT * FROM #PubAdvTransData pat
     WHERE (pat.LastAdDate > @sp_Date)

>2010-02-01 00:00:00.000
>2010-04-29 21:12:29.920

您确定LastAdDate的类型为DATETIME吗？

Answer 2

如果您使用静态日期值手动写出查询（例如'2009-10-29 13：13：07.440'），您会得到任何行吗？

所以，你说以下两个查询产生了正确的结果：

SELECT DISTINCT pat.PublicationID
FROM PubAdvTransData AS pat 
    INNER JOIN PubAdvertiser AS pa 
        ON pat.AdvTransID = pa.AdvTransID
WHERE (pat.LastAdDate > '2009-10-29 13:13:07.440') AND (pa.AdvertiserID = 12345))

DECLARE @sp_Date DATETIME
SET @sp_Date = '2009-10-29 13:13:07.440'

SELECT DISTINCT pat.PublicationID
FROM PubAdvTransData AS pat 
    INNER JOIN PubAdvertiser AS pa 
        ON pat.AdvTransID = pa.AdvTransID
WHERE (pat.LastAdDate > @sp_Date) AND (pa.AdvertiserID = 12345))

SQL如何正确设置日期变量值并使用它？

2 个答案: