On Wed, Jul 26, 2023 at 07:53:36AM +0200, Laurenz Albe wrote: > On Fri, 2023-07-21 at 04:56 +0000, PG Doc comments form wrote: > > The following documentation comment has been logged on the website: > > > > Page: https://www.postgresql.org/docs/15/functions-formatting.html > > Description: > > > > I've encountered an issue with to_char(numeric type, text) > > Apparently, it uses rounding instead of truncation which leads to > > unpexpected results. This is not reflected in the documentation. > > My specific example: > > select to_Char(1235::real/(2::real+1235::real)*100, '99%') > > The expected output was 99%. The output was ##% - since the number was > > rounded to 100, there wasn't enough digits in the format. > > If I add a digit after the decimal point > > select to_char(1235::real/(2::real+1235::real)*100,'90D0%') > > The output becomes 99.8% > > > > It would be nice to have this behavior explained in the documentation so > > people get more predictable results. > > +1 > > How about the following:
I slightly modified your patch and applied it back to PG 11 since all supported Postgres versions have the same behavior. Thanks. -- Bruce Momjian <br...@momjian.us> https://momjian.us EDB https://enterprisedb.com Only you can decide what is important to you.
