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SQL round off issue


Should you choose the MONEY or DECIMAL(x,y) datatypes in SQL Server?How can I prevent SQL injection in PHP?How do I perform an IF…THEN in an SQL SELECT?Add a column with a default value to an existing table in SQL ServerHow to return only the Date from a SQL Server DateTime datatypeHow to check if a column exists in a SQL Server table?How to concatenate text from multiple rows into a single text string in SQL server?Parameterize an SQL IN clauseInserting multiple rows in a single SQL query?How do I UPDATE from a SELECT in SQL Server?Finding duplicate values in a SQL table






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0















Consider these values which are of type MONEY (sample values and these can change)



select 4796.529 + 1585.0414 + 350.9863 + 223.3549 + 127.6314+479.6529 + 158.5041


for some reason I need to round each value to a scale of 3 like this



select round(4796.529,3)+ round(1585.0414,3)+ round(350.9863,3)+ round(223.3549,3)+ round(127.6314,3)+ round(479.6529,3)+ round(158.5041,3)


but when I take the sum they shows a very minor variation. first line of code returns 7721.7000. and the second one 7721.6990. But this variation in not acceptable. What is the best way to solve this ?










share|improve this question

















  • 1





    "The money and smallmoney data types are accurate to a ten-thousandth of the monetary units that they represent. For Informatica, the money and smallmoney data types are accurate to a one-hundredth of the monetary units that they represent."

    – Zohar Peled
    Mar 26 at 7:25











  • mathematics instead of technical, i believe. so just follow the way business requires.

    – Rex
    Mar 26 at 7:28

















0















Consider these values which are of type MONEY (sample values and these can change)



select 4796.529 + 1585.0414 + 350.9863 + 223.3549 + 127.6314+479.6529 + 158.5041


for some reason I need to round each value to a scale of 3 like this



select round(4796.529,3)+ round(1585.0414,3)+ round(350.9863,3)+ round(223.3549,3)+ round(127.6314,3)+ round(479.6529,3)+ round(158.5041,3)


but when I take the sum they shows a very minor variation. first line of code returns 7721.7000. and the second one 7721.6990. But this variation in not acceptable. What is the best way to solve this ?










share|improve this question

















  • 1





    "The money and smallmoney data types are accurate to a ten-thousandth of the monetary units that they represent. For Informatica, the money and smallmoney data types are accurate to a one-hundredth of the monetary units that they represent."

    – Zohar Peled
    Mar 26 at 7:25











  • mathematics instead of technical, i believe. so just follow the way business requires.

    – Rex
    Mar 26 at 7:28













0












0








0








Consider these values which are of type MONEY (sample values and these can change)



select 4796.529 + 1585.0414 + 350.9863 + 223.3549 + 127.6314+479.6529 + 158.5041


for some reason I need to round each value to a scale of 3 like this



select round(4796.529,3)+ round(1585.0414,3)+ round(350.9863,3)+ round(223.3549,3)+ round(127.6314,3)+ round(479.6529,3)+ round(158.5041,3)


but when I take the sum they shows a very minor variation. first line of code returns 7721.7000. and the second one 7721.6990. But this variation in not acceptable. What is the best way to solve this ?










share|improve this question














Consider these values which are of type MONEY (sample values and these can change)



select 4796.529 + 1585.0414 + 350.9863 + 223.3549 + 127.6314+479.6529 + 158.5041


for some reason I need to round each value to a scale of 3 like this



select round(4796.529,3)+ round(1585.0414,3)+ round(350.9863,3)+ round(223.3549,3)+ round(127.6314,3)+ round(479.6529,3)+ round(158.5041,3)


but when I take the sum they shows a very minor variation. first line of code returns 7721.7000. and the second one 7721.6990. But this variation in not acceptable. What is the best way to solve this ?







sql sql-server






share|improve this question













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share|improve this question










asked Mar 26 at 7:20









Vishnu BabuVishnu Babu

63810 silver badges24 bronze badges




63810 silver badges24 bronze badges







  • 1





    "The money and smallmoney data types are accurate to a ten-thousandth of the monetary units that they represent. For Informatica, the money and smallmoney data types are accurate to a one-hundredth of the monetary units that they represent."

    – Zohar Peled
    Mar 26 at 7:25











  • mathematics instead of technical, i believe. so just follow the way business requires.

    – Rex
    Mar 26 at 7:28












  • 1





    "The money and smallmoney data types are accurate to a ten-thousandth of the monetary units that they represent. For Informatica, the money and smallmoney data types are accurate to a one-hundredth of the monetary units that they represent."

    – Zohar Peled
    Mar 26 at 7:25











  • mathematics instead of technical, i believe. so just follow the way business requires.

    – Rex
    Mar 26 at 7:28







1




1





"The money and smallmoney data types are accurate to a ten-thousandth of the monetary units that they represent. For Informatica, the money and smallmoney data types are accurate to a one-hundredth of the monetary units that they represent."

– Zohar Peled
Mar 26 at 7:25





"The money and smallmoney data types are accurate to a ten-thousandth of the monetary units that they represent. For Informatica, the money and smallmoney data types are accurate to a one-hundredth of the monetary units that they represent."

– Zohar Peled
Mar 26 at 7:25













mathematics instead of technical, i believe. so just follow the way business requires.

– Rex
Mar 26 at 7:28





mathematics instead of technical, i believe. so just follow the way business requires.

– Rex
Mar 26 at 7:28












2 Answers
2






active

oldest

votes


















3














When you round numbers before you sum them you will get a different result than if you round numbers after you have summed them. Simple as that. There is no way to solve this.






share|improve this answer
































    4














    As Whencesoever said, your problem is mathmatical one, not a programming error.



    • 12.5 + 11.6 = 24.1

    • ROUND(12.5) + ROUND(11.6) = 25

    • ROUND(12.5 + 11.6) = 24

    I'd talk with the business and figure out where they want the rounding applied.



    Also, as a side note, MONEY is a terrible datatype. If you can, you may want to consider switching to a DECIMAL. See Should you choose the MONEY or DECIMAL(x,y) datatypes in SQL Server?






    share|improve this answer























    • if they're simply looking for a rounded total, then perhaps summing them up and rounding the result is what they're actually looking for instead of rounding each of the numbers individually?

      – user2366842
      Mar 27 at 2:27













    Your Answer






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    2 Answers
    2






    active

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    2 Answers
    2






    active

    oldest

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    active

    oldest

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    active

    oldest

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    3














    When you round numbers before you sum them you will get a different result than if you round numbers after you have summed them. Simple as that. There is no way to solve this.






    share|improve this answer





























      3














      When you round numbers before you sum them you will get a different result than if you round numbers after you have summed them. Simple as that. There is no way to solve this.






      share|improve this answer



























        3












        3








        3







        When you round numbers before you sum them you will get a different result than if you round numbers after you have summed them. Simple as that. There is no way to solve this.






        share|improve this answer















        When you round numbers before you sum them you will get a different result than if you round numbers after you have summed them. Simple as that. There is no way to solve this.







        share|improve this answer














        share|improve this answer



        share|improve this answer








        edited Mar 26 at 7:28









        Dale Burrell

        4,1785 gold badges27 silver badges57 bronze badges




        4,1785 gold badges27 silver badges57 bronze badges










        answered Mar 26 at 7:26









        WhencesoeverWhencesoever

        1,6818 silver badges19 bronze badges




        1,6818 silver badges19 bronze badges























            4














            As Whencesoever said, your problem is mathmatical one, not a programming error.



            • 12.5 + 11.6 = 24.1

            • ROUND(12.5) + ROUND(11.6) = 25

            • ROUND(12.5 + 11.6) = 24

            I'd talk with the business and figure out where they want the rounding applied.



            Also, as a side note, MONEY is a terrible datatype. If you can, you may want to consider switching to a DECIMAL. See Should you choose the MONEY or DECIMAL(x,y) datatypes in SQL Server?






            share|improve this answer























            • if they're simply looking for a rounded total, then perhaps summing them up and rounding the result is what they're actually looking for instead of rounding each of the numbers individually?

              – user2366842
              Mar 27 at 2:27















            4














            As Whencesoever said, your problem is mathmatical one, not a programming error.



            • 12.5 + 11.6 = 24.1

            • ROUND(12.5) + ROUND(11.6) = 25

            • ROUND(12.5 + 11.6) = 24

            I'd talk with the business and figure out where they want the rounding applied.



            Also, as a side note, MONEY is a terrible datatype. If you can, you may want to consider switching to a DECIMAL. See Should you choose the MONEY or DECIMAL(x,y) datatypes in SQL Server?






            share|improve this answer























            • if they're simply looking for a rounded total, then perhaps summing them up and rounding the result is what they're actually looking for instead of rounding each of the numbers individually?

              – user2366842
              Mar 27 at 2:27













            4












            4








            4







            As Whencesoever said, your problem is mathmatical one, not a programming error.



            • 12.5 + 11.6 = 24.1

            • ROUND(12.5) + ROUND(11.6) = 25

            • ROUND(12.5 + 11.6) = 24

            I'd talk with the business and figure out where they want the rounding applied.



            Also, as a side note, MONEY is a terrible datatype. If you can, you may want to consider switching to a DECIMAL. See Should you choose the MONEY or DECIMAL(x,y) datatypes in SQL Server?






            share|improve this answer













            As Whencesoever said, your problem is mathmatical one, not a programming error.



            • 12.5 + 11.6 = 24.1

            • ROUND(12.5) + ROUND(11.6) = 25

            • ROUND(12.5 + 11.6) = 24

            I'd talk with the business and figure out where they want the rounding applied.



            Also, as a side note, MONEY is a terrible datatype. If you can, you may want to consider switching to a DECIMAL. See Should you choose the MONEY or DECIMAL(x,y) datatypes in SQL Server?







            share|improve this answer












            share|improve this answer



            share|improve this answer










            answered Mar 26 at 7:37









            MooseMoose

            1709 bronze badges




            1709 bronze badges












            • if they're simply looking for a rounded total, then perhaps summing them up and rounding the result is what they're actually looking for instead of rounding each of the numbers individually?

              – user2366842
              Mar 27 at 2:27

















            • if they're simply looking for a rounded total, then perhaps summing them up and rounding the result is what they're actually looking for instead of rounding each of the numbers individually?

              – user2366842
              Mar 27 at 2:27
















            if they're simply looking for a rounded total, then perhaps summing them up and rounding the result is what they're actually looking for instead of rounding each of the numbers individually?

            – user2366842
            Mar 27 at 2:27





            if they're simply looking for a rounded total, then perhaps summing them up and rounding the result is what they're actually looking for instead of rounding each of the numbers individually?

            – user2366842
            Mar 27 at 2:27

















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