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  • sql如何取某年某月的第一天和最后一天

    sql如何取某年某月的第一天和最后一天

    SELECT CAST((LEFT('20093',4)+'-'+SUBSTRING('20093',5,LEN('20093'))+'-'+'01') AS DATETIME)
    --
    第一天
    SELECT DATEADD(DAY,-1,DATEADD(MONTH,1,CAST((LEFT('20093',4)+'-'+SUBSTRING('20093',5,LEN('20093'))+'-'+'01') AS DATETIME)))
    --
    最后一天

    原理:第一天肯定是1号拉 ,最后一天是下个月第一天减一天

    【数据所在服务器】本月的第一天和最后一天:

    SELECT dateadd(ms,-1,DATEADD(mm, DATEDIFF(m,0,getdate()), 0)) as mouthfirstdate,dateadd(ms,-3,DATEADD(mm, DATEDIFF(m,0,getdate())+1, 0)) as mouthlastdate

    ===============================最后一天=====================================

    本月【数据所在服务器】最后一天:

    SELECT dateadd(ms,-3,DATEADD(mm, DATEDIFF(m,0,getdate())+1, 0)) as mouthlastdate

    下月【数据所在服务器】最后一天:

    SELECT dateadd(ms,-3,DATEADD(mm, DATEDIFF(m,0,getdate())+2, 0)) as mouthlastdate

    下下月【数据所在服务器】最后一天:

    SELECT dateadd(ms,-3,DATEADD(mm, DATEDIFF(m,0,getdate())+3, 0)) as mouthlastdate

    下下下月【数据所在服务器】最后一天:

    SELECT dateadd(ms,-3,DATEADD(mm, DATEDIFF(m,0,getdate())+4, 0)) as mouthlastdate

    下下下月【数据所在服务器】最后一天:

    SELECT dateadd(ms,-3,DATEADD(mm, DATEDIFF(m,0,getdate())+5, 0)) as mouthlastdate

    下下下下月【数据所在服务器】最后一天:

    SELECT dateadd(ms,-3,DATEADD(mm, DATEDIFF(m,0,getdate())+6, 0)) as mouthlastdate

    ===============================第一天=====================================

    本月第一天

    SELECT dateadd(ms,-1,DATEADD(mm, DATEDIFF(m,0,getdate()), 0)) as mouthlastdate

    下月第一天:

    SELECT dateadd(ms,-1,DATEADD(mm, DATEDIFF(m,0,getdate())+1, 0)) as mouthlastdate

    下下月第一天:

    SELECT dateadd(ms,-1,DATEADD(mm, DATEDIFF(m,0,getdate())+2, 0)) as mouthlastdate

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  • 原文地址:https://www.cnblogs.com/liuzhuqing/p/7480565.html
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