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## Re: precision and scale functions for numeric

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### pgsql-hackers by date

On Sun, Apr 29, 2012 at 1:51 PM, Peter Eisentraut <peter_e(at)gmx(dot)net> wrote: > I didn't find a good way to find out how many digits a numeric value has > or things like whether a numeric value is an integer. (I had to go > through bc(1) for the latter.) Functions like precision() and scale() > would have been quite handy. Are there other ways to do this, or would > this make a good addition? I think you could test for integer-ness by testing whether val % 0 = 0. You could in general test of digits after the decimal point by casting the value to text and using POSITION() to find the decimal point. If POSITION() returns zero then zero; else subtract the result from the string length. Similarly, it's pretty easy to regexp away the non-digits and measure the length of the resulting string. I don't have a good feeling for whether these operations are common enough to justify adding a few more functions. They haven't yet come up for me personally. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company

- precision and scale functions for numeric at 2012-04-29 17:51:37 from Peter Eisentraut

- Re: precision and scale functions for numeric at 2012-04-30 19:33:48 from David Johnston

Next: From:Merlin MoncureDate:2012-04-30 18:33:26Subject: Re: Future In-Core ReplicationPrevious: From: Robert HaasDate: 2012-04-30 18:07:26Subject: Re: Patch: add conversion from pg_wchar to multibyte