Round Natural Numbers to the nearest Power of 10

 Author Message hkravitz SSC Veteran Group: General Forum Members Points: 295 Visits: 225 Comments posted to this topic are about the item Round Natural Numbers to the nearest Power of 10 t.franz Ten Centuries Group: General Forum Members Points: 1329 Visits: 297 Why do you not use the build in ROUND function?It takes three parameters: - the value- the rounding length (use negative numbers to round to a power of 10, example for 12345: -1 -> = 12350, -2 -> 12300, -3 = 12000- optional 0 or 1, while the default 0 rounds, while 1 will cut the numbers off; `ROUND(12345, -1, 0) = 12350` while `ROUND(12345, -1, 1) = 12340`The only benefit of your function is the easier usage of the direction (up or down), but this could be solved by cutting off the decimals (= rounding down) and adding 10 (or 100 or 1000...) when you want to round up: `ROUND(12345, -1, 1) + 10`PS: Bonus points for using an INLINE TABLE VALUE function instead of a scalar function Luis Cazares SSC Guru Group: General Forum Members Points: 65288 Visits: 20238 Your function has a problem when it's used against negative numbers. I wrote an article some time ago about this options which simulate CEILING and FLOOR. You can read it in here: http://www.sqlservercentral.com/articles/T-SQL/145448/sHere's a corrected version for your function`CREATE FUNCTION dbo.udf_RoundNearest(@Number bigint, /*Natural Number*/@RoundNearest float, /*Power of 10, 10^n , 10,100,1000...*/@Direction int /* 0-> Down , 1 -> Up */)RETURNS TABLE AS RETURNSELECT CASE WHEN @Direction = 0 THEN ROUND(@Number-(.49*@RoundNearest),-LOG10(@RoundNearest)) ELSE ROUND(@Number+(.49*@RoundNearest),-LOG10(@RoundNearest)) END NumberGO` Luis C.General Disclaimer:Are you seriously taking the advice and code from someone from the internet without testing it? Do you at least understand it? Or can it easily kill your server?How to post data/code on a forum to get the best help: Option 1 / Option 2 hkravitz SSC Veteran Group: General Forum Members Points: 295 Visits: 225 +xLuis Cazares - Tuesday, May 16, 2017 6:27 AMYour function has a problem when it's used against negative numbers. I wrote an article some time ago about this options which simulate CEILING and FLOOR. You can read it in here: http://www.sqlservercentral.com/articles/T-SQL/145448/sHere's a corrected version for your function`CREATE FUNCTION dbo.udf_RoundNearest(@Number bigint, /*Natural Number*/@RoundNearest float, /*Power of 10, 10^n , 10,100,1000...*/@Direction int /* 0-> Down , 1 -> Up */)RETURNS TABLE AS RETURNSELECT CASE WHEN @Direction = 0 THEN ROUND(@Number-(.49*@RoundNearest),-LOG10(@RoundNearest)) ELSE ROUND(@Number+(.49*@RoundNearest),-LOG10(@RoundNearest)) END NumberGO`Thank you for your input! hkravitz SSC Veteran Group: General Forum Members Points: 295 Visits: 225 +xt.franz - Tuesday, May 16, 2017 2:56 AMWhy do you not use the build in ROUND function?It takes three parameters: - the value- the rounding length (use negative numbers to round to a power of 10, example for 12345: -1 -> = 12350, -2 -> 12300, -3 = 12000- optional 0 or 1, while the default 0 rounds, while 1 will cut the numbers off; `ROUND(12345, -1, 0) = 12350` while `ROUND(12345, -1, 1) = 12340`The only benefit of your function is the easier usage of the direction (up or down), but this could be solved by cutting off the decimals (= rounding down) and adding 10 (or 100 or 1000...) when you want to round up: `ROUND(12345, -1, 1) + 10`PS: Bonus points for using an INLINE TABLE VALUE function instead of a scalar functionThanks!