我有一个SQL查询,可以选择24小时内的所有记录,但是,我需要更新它以选择一个月内的所有记录(相对于记录时间戳)。因此,例如,如果我在2月份选择了任何记录,它应该返回从月份开始到月末的所有记录。
我每日查询的代码是:
SELECT Snapshot.xId, MAX(Snapshot.TimeStamp) AS Timestamp_Actual,
dateadd(dd, datediff(dd,0, MAX(Snapshot.TimeStamp)), 0) AS TimestampRange_Start,
dateadd(MI, 1439, dateadd(dd, datediff(dd,0, MAX(Snapshot.TimeStamp)), 0)) AS TimestampRange_End
FROM Snapshot
GROUP BY Snapshot.xId
到目前为止我所拥有的是:
SELECT Snapshot.xId, MAX(Snapshot.TimeStamp) AS Timestamp_Actual,
dateadd(mm, datediff(mm,0, MAX(Snapshot.TimeStamp)), 0) AS TimestampRange_Start,
dateadd(dd, 0, dateadd(mm, datediff(mm,0, MAX(Snapshot.TimeStamp)), 0)) AS TimestampRange_End
FROM Snapshot
GROUP BY Snapshot.xId
从上面的语句中,我可以包含一个标准的WHERE子句来检查TimestampRange_Start和TimestampRange_End的值,看看Timestamp_Actual是否介于它们之间。
答案 0 :(得分:1)
SELECT Snapshot.xId, MAX(Snapshot.TimeStamp) AS Timestamp_Actual
FROM Snapshot
GROUP BY Snapshot.xId
HAVING MAX(Snapshot.TimeStamp) >= dateadd(mm, datediff(mm, 0, getdate()), 0)
AND MAX(Snapshot.TimeStamp) < dateadd(mm, 1+datediff(mm, 0, getdate()), 0)