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    How to create SQL queries that return specific calculated dates respective to today's date and to avoid hard coding these dates within the query itself

    How to create SQL queries that return specific calculated dates respective to today's date and to avoid hard coding these dates within the query itself.

    Struxureware Power Monitoring
    Power Monitoring Expert
    ION Enterprise

    SQL Server (any version)

    *Warning: Irreparable database damage can occur. This procedure should only be performed by users familiar with SQL Server Management Studio. Databases should be backed up prior to performing this procedure.* 

    The following sample queries (ex. 1-5) depict the use of various SQL functions to calculate and return specific dates respective to today's date. 
    These SQL queries can then be used as sub-queries within another SQL query's WHERE clause to retrieve specific period of data based on the dynamically calculated date range. (ex. 6)  The below queries illustrate just a small sample of the possible use cases. These can be used in many other situations and tailored to meet your specific requirement.

    1) Select CONVERT(VARCHAR(25),DATEADD(dd,-(DAY(GETDATE())),GETDATE()),101) AS Date_Value, 'Last Day of Previous Month' AS Date_Type

    2) Select CONVERT(VARCHAR(25),DATEADD(dd,-(DAY(GETDATE())-1),GETDATE()),101) As Date_Value, 'First Day of Current Month' AS Date_Type

    3) Select CONVERT(VARCHAR(25),GETDATE(),101) As Date_Value, 'Today' As Date_Type

    4) Select CONVERT(VARCHAR(25),DATEADD(dd,-(DAY(DATEADD(mm,1,GETDATE()))),DATEADD(mm,1,GETDATE())),101) As Date_Value, 'Last Day of Current Month' As Date_Type

    5) Select CONVERT(VARCHAR(25),DATEADD(dd,-(DAY(DATEADD(mm,1,GETDATE()))-1),DATEADD(mm,1,GETDATE())),101) As Date_Value, 'First Day of Next Month'As Date_Type

    6) Select * from EEM_DataLog
        TimestampUTC >=  (SELECT CONVERT(VARCHAR(25),GETDATE(),101))
        TimestampUTC <=  (SELECT CONVERT(VARCHAR(25),DATEADD(dd,-(DAY(DATEADD(mm,1,GETDATE()))),DATEADD(mm,1,GETDATE())),101))

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