Scaled-down SQL

 Author Message pksutha SSC-Enthusiastic Group: General Forum Members Points: 115 Visits: 58 My answer is like this first part which is i 've answered:Declare @value1 decimal(20,10),@value2 decimal(20,3) SET @value1 = 1234567890.123456789SET @value2 = 0.1SELECT @value1 * @value2Second part is screened answer:DECLARE @value1 DECIMAL(20,10), @value2 DECIMAL(30,13) SET @value1 = 1234567890.123456789SET @value2 = 0.1SELECT @value1 * @value2Ans:The screened answer is u 've declared value2 decimal(30,13)... why u need like that?my answer is Declare @value1 decimal(20,10),@value2 decimal(20,3)...... this is enough in SQL server 2005 Duncan Pryde SSCertifiable Group: General Forum Members Points: 5382 Visits: 1552 pksutha (3/22/2011)My answer is like this first part which is i 've answered:Declare @value1 decimal(20,10),@value2 decimal(20,3) SET @value1 = 1234567890.123456789SET @value2 = 0.1SELECT @value1 * @value2Second part is screened answer:DECLARE @value1 DECIMAL(20,10), @value2 DECIMAL(30,13) SET @value1 = 1234567890.123456789SET @value2 = 0.1SELECT @value1 * @value2Ans:The screened answer is u 've declared value2 decimal(30,13)... why u need like that?my answer is Declare @value1 decimal(20,10),@value2 decimal(20,3)...... this is enough in SQL server 2005That's kind of the "moral" of the question. Never use a "bigger" decimal/numeric than you actually need. michael.kaufmann SSCommitted Group: General Forum Members Points: 1925 Visits: 1082 Duncan Pryde (3/21/2011)michael.kaufmann (3/21/2011)tilew-948340 (3/20/2011)[...][...]Excellent explanation. Couldn't have put it better myself.Thank you very much for your kind words of appreciation, Duncan.Thanks again for your question and great explanation.Regards,Michael Toreador SSCertifiable Group: General Forum Members Points: 5936 Visits: 8278 Duncan Pryde (3/22/2011)That's kind of the "moral" of the question. Never use a "bigger" decimal/numeric than you actually need.The moral I've drawn is that maybe Floats aren't as bad as we thought... rlswisher SSC Veteran Group: General Forum Members Points: 298 Visits: 104 Declare @value1 numeric(38,10)Declare @value2 numeric(1,1)SET @value1 = 1234567890.123456789SET @value2 = 0.1SELECT @value1 SELECT @value2SELECT @value1 * @value2= "123456789.012345679" Duncan Pryde SSCertifiable Group: General Forum Members Points: 5382 Visits: 1552 rlswisher (3/22/2011)Declare @value1 numeric(38,10)Declare @value2 numeric(1,1)SET @value1 = 1234567890.123456789SET @value2 = 0.1SELECT @value1 SELECT @value2SELECT @value1 * @value2= "123456789.012345679"As expected.Result precision is 38+1+1 = 40, scale is 10+1 = 11. Max allowed precision is 38, so precision and scale are reduced by 2, giving a final result precision and scale of 38,9 - which is why the result is rounded as you can see. Duncan Pryde SSCertifiable Group: General Forum Members Points: 5382 Visits: 1552 Toreador (3/22/2011)Duncan Pryde (3/22/2011)That's kind of the "moral" of the question. Never use a "bigger" decimal/numeric than you actually need.The moral I've drawn is that maybe Floats aren't as bad as we thought...Until you want to do something like this Gopi S Mr or Mrs. 500 Group: General Forum Members Points: 591 Visits: 325 Excellent question and nice explanation..Learned something new that Precision and Scale varies for the resulting value based on (+, -, / , *, [UNION | EXCEPT | INTERSECT] , % ) .Thanks for posting this... SQLRNNR SSC Guru Group: General Forum Members Points: 143985 Visits: 18651 great qeustion Jason...AKA CirqueDeSQLeil_______________________________________________I have given a name to my pain...MCM SQL Server, MVPSQL RNNRPosting Performance Based Questions - Gail ShawLearn Extended Events SanDroid SSCarpal Tunnel Group: General Forum Members Points: 4624 Visits: 1046 Great question. You would not believe how long and how often programers get this wrong. There is even a list that is maintained of ROM chips that do weight conversions incorrectly becuase Dec(6,2) is used instead of Dec(13,5)I even had to "show the math" on this exact thing a year ago when I had to explain why the weight conversion code used to change Pound to Kilos and vice versa was wrong in every appliation where I work. Not understanding this math is why so many ships have a problem balancing thier loads.Sometimes the cargo is weighed in pounds and the balast program uses Kilos.Then someone uses a cheap hand calculator to convert the 100,000 tons in pounds to Kilos and the weghts off by at least 1,000 tons.

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