如何删除MS SQL数据库中最旧的星期(句号)? [英] How to delete oldest week(period) in MS SQL database?

问题描述

MS SQL 2008R2 Express，我有数据库-一个带行的表.当数据库大小变为约10GB时，我需要清理此表中最旧的一周(我不知道日期).您能帮我编写脚本吗?谢谢.

MS SQL 2008R2 Express, I have database - one table with rows. And when db size became about 10gb I need to clean one oldest week in this table (I dont know the date). Could you help me with script? Thanks.

UPD1. 有列DateAndTime，所以我在VBA中进行如下查询:

UPD1. There is column DateAndTime, so i make query like this in VBA:

strSQL = "SELECT DateAndTime
                ,TagName
                ,Val
                ,SetPoint
                ,Limit_H
                ,Limit_L
                ,Result 
          FROM dbo.Statistic 
          WHERE DateAndTime  BETWEEN CAST('" & TimeBegin & "' AS datetime) AND CAST( '" & TimeEnd & " ' AS datetime) 
          Order By DateAndTime desc , (CASE WHEN ISNUMERIC(TagName)=1 THEN CAST(CAST(TagName AS float) AS INT)END ) desc"

推荐答案

这是怎么回事-

DELETE YOUR_TABLE
WHERE DATE_COL BETWEEN (SELECT MIN(DATE) FROM YOUR_TABLE) AND (SELECT MIN(DATE) FROM YOUR_TABLE) + 7

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