Filter Table by a Historical 'Last Day of the Month'





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I have a daily appending table, that I need a formula for that would filter the table results to just the last day of any given historical month. For example:



Table:



DwDate            Balance

20181231           $10

20190131           $80   

20190228           $75

20190331           $50


99% of the time I just need the MAX DwDate, which would be:



@MaxDate = (SELECT MAX(DwDate) FROM dbo.TABLE)


However, occasionally I need a formula that would allow me to go back 1 or 2 months:



@MaxDate - 2 Months





sql-server-2016 date date-math







share|improve this question































    2















    I have a daily appending table, that I need a formula for that would filter the table results to just the last day of any given historical month. For example:



    Table:



    DwDate            Balance
    
20181231           $10
    
20190131           $80   
    
20190228           $75
    
20190331           $50


    99% of the time I just need the MAX DwDate, which would be:



    @MaxDate = (SELECT MAX(DwDate) FROM dbo.TABLE)


    However, occasionally I need a formula that would allow me to go back 1 or 2 months:



    @MaxDate - 2 Months





    sql-server-2016 date date-math







    share|improve this question



























      2












      2








      2








      I have a daily appending table, that I need a formula for that would filter the table results to just the last day of any given historical month. For example:



      Table:



      DwDate            Balance
      
20181231           $10
      
20190131           $80   
      
20190228           $75
      
20190331           $50


      99% of the time I just need the MAX DwDate, which would be:



      @MaxDate = (SELECT MAX(DwDate) FROM dbo.TABLE)


      However, occasionally I need a formula that would allow me to go back 1 or 2 months:



      @MaxDate - 2 Months





      sql-server-2016 date date-math







      share|improve this question
















      I have a daily appending table, that I need a formula for that would filter the table results to just the last day of any given historical month. For example:



      Table:



      DwDate            Balance
      
20181231           $10
      
20190131           $80   
      
20190228           $75
      
20190331           $50


      99% of the time I just need the MAX DwDate, which would be:



      @MaxDate = (SELECT MAX(DwDate) FROM dbo.TABLE)


      However, occasionally I need a formula that would allow me to go back 1 or 2 months:



      @MaxDate - 2 Months





      sql-server-2016 date date-math




      sql-server-2016 date date-math






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited 2 hours ago









      sticky bit

      2,053415




      2,053415










      asked 3 hours ago









      Mike JonesMike Jones

      554




      554






















          1 Answer
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          To subract a month from a date you can use dateadd().



          For example



          SET @MaxDate = dateadd(month, -1, @MaxDate);


          would subtract one month from your @MaxDate. That would keep the day of the month though. (Unless this day doesn't exists for the month, then it's the last day of the month, so e.g. the 31th day might become the 30th.)



          To get the date of the last day of a month a date is in eomonth() can be used.



          SET @MaxDate = eomonth(@MaxDate);


          would set @MaxDate to the last day of the month @MaxDate was previously in.



          eomonth() optionally takes a second argument, which is an integer to add to the month. So to set @MaxDate to the last day of the previous month of @MaxDate you might use



          SET @MaxDate = eomonth(@MaxDate, -1);





          share|improve this answer
























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            1 Answer
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            active

            oldest

            votes








            1 Answer
            1






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes









            2














            To subract a month from a date you can use dateadd().



            For example



            SET @MaxDate = dateadd(month, -1, @MaxDate);


            would subtract one month from your @MaxDate. That would keep the day of the month though. (Unless this day doesn't exists for the month, then it's the last day of the month, so e.g. the 31th day might become the 30th.)



            To get the date of the last day of a month a date is in eomonth() can be used.



            SET @MaxDate = eomonth(@MaxDate);


            would set @MaxDate to the last day of the month @MaxDate was previously in.



            eomonth() optionally takes a second argument, which is an integer to add to the month. So to set @MaxDate to the last day of the previous month of @MaxDate you might use



            SET @MaxDate = eomonth(@MaxDate, -1);





            share|improve this answer




























              2














              To subract a month from a date you can use dateadd().



              For example



              SET @MaxDate = dateadd(month, -1, @MaxDate);


              would subtract one month from your @MaxDate. That would keep the day of the month though. (Unless this day doesn't exists for the month, then it's the last day of the month, so e.g. the 31th day might become the 30th.)



              To get the date of the last day of a month a date is in eomonth() can be used.



              SET @MaxDate = eomonth(@MaxDate);


              would set @MaxDate to the last day of the month @MaxDate was previously in.



              eomonth() optionally takes a second argument, which is an integer to add to the month. So to set @MaxDate to the last day of the previous month of @MaxDate you might use



              SET @MaxDate = eomonth(@MaxDate, -1);





              share|improve this answer


























                2












                2








                2







                To subract a month from a date you can use dateadd().



                For example



                SET @MaxDate = dateadd(month, -1, @MaxDate);


                would subtract one month from your @MaxDate. That would keep the day of the month though. (Unless this day doesn't exists for the month, then it's the last day of the month, so e.g. the 31th day might become the 30th.)



                To get the date of the last day of a month a date is in eomonth() can be used.



                SET @MaxDate = eomonth(@MaxDate);


                would set @MaxDate to the last day of the month @MaxDate was previously in.



                eomonth() optionally takes a second argument, which is an integer to add to the month. So to set @MaxDate to the last day of the previous month of @MaxDate you might use



                SET @MaxDate = eomonth(@MaxDate, -1);





                share|improve this answer













                To subract a month from a date you can use dateadd().



                For example



                SET @MaxDate = dateadd(month, -1, @MaxDate);


                would subtract one month from your @MaxDate. That would keep the day of the month though. (Unless this day doesn't exists for the month, then it's the last day of the month, so e.g. the 31th day might become the 30th.)



                To get the date of the last day of a month a date is in eomonth() can be used.



                SET @MaxDate = eomonth(@MaxDate);


                would set @MaxDate to the last day of the month @MaxDate was previously in.



                eomonth() optionally takes a second argument, which is an integer to add to the month. So to set @MaxDate to the last day of the previous month of @MaxDate you might use



                SET @MaxDate = eomonth(@MaxDate, -1);






                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered 2 hours ago









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