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## Question of the Day for 29 Jan 2007

 Author Message N.Johnson SSC Rookie Group: General Forum Members Points: 25 Visits: 43 This was an interesting question. Such a simple thing, of course it would be 3.33333... ad infinitum. Not so, when I tested it! When the answer appeared, I wondered whether the default data type was variant. Then I wondered what would happen with 10.0 / 3 ... which also turned out to be an interesting result.Thanks for keeping our brains agile. Norm Johnson"Keep smiling ... it gives your face something happy to do ... and it makes people wonder what you're up to!" jeremy nyc Grasshopper Group: General Forum Members Points: 23 Visits: 1 OK, no testing....What does this return?select 10 / 3.3And this?select 10 / 3.33You can see a nice (if you like math) progression happening there. But what if you're really bored, and you keep adding 3s? Well, if you go far enough, you get this:Server: Msg 8115, Level 16, State 2, Line 1Arithmetic overflow error converting expression to data type numeric.Fair enough, it would be silly to expect SQL Server to put up with an infinite number of digits. But if you add those threes one-by-one, you'll see some interesting results.select 10 / 3.33333333333333333returns3.0000000000000000030select 10 / 3.333333333333333333returns3.000000000000000000So presumably, at this point, we've run out of degrees of accuracy (can't remember the actual term for that, but y'all get the point). But wait, look at the length of the returned values--the new one hasn't just pushed the three out of the visible range, it's actually gotten shorter! Let's add another three:select 10 / 3.3333333333333333333returns3.00000000000000000It's one character shorter again! And if we keep adding threes, we keep getting shorter and shorter results, all the way until select 10 / 3.333333333333333333333333333333returns3.000000And then, of course, we add one more three and are told that our arithmetic has overflowed.Total usable value of this experiment: not really much at all. But it was fun.Anyone know the intricacies of the math engine well enough to describe what's happening to produce the shorter results? My guess is that it's something quite simple, but I'd be interested to know what the machinations are.JeremyNYC kapil_kk Hall of Fame Group: General Forum Members Points: 3069 Visits: 2766 this is not the the question of the standard of SQl Server central _______________________________________________________________To get quick answer follow this link:http://www.sqlservercentral.com/articles/Best+Practices/61537/ Iwas Bornready SSChampion Group: General Forum Members Points: 13766 Visits: 885 A simple integer divide.

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