From: | Thom Brown <thom(at)linux(dot)com> |
---|---|
To: | pgsql-docs <pgsql-docs(at)postgresql(dot)org> |
Subject: | Substring undocumented form |
Date: | 2010-09-25 08:36:36 |
Message-ID: | AANLkTik_6-gdHaekS7YN8BKN0Rwv8WpxdbaA5ha0Ld0F@mail.gmail.com |
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Lists: | pgsql-docs |
Hi all,
Someone submitted a comment to the documentation which made mention of
the fact that while we provide one form of the 3-parameter substring
function, we don't mention an alternative one.
substring(string from pattern for escape)
can be written:
substring(string, pattern, escape)
Curiously, this doesn't appear to be the same with similar functions.
For instance, the following can't be changed in a similar way:
overlay('Txxxxas' placing 'hom' from 2 for 4)
can't be written:
overlay('Txxxxas', 'hom', 2, 4)
position('om' in 'Thomas')
can't be written:
position('om', 'Thomas')
So this doesn't look like a general alternative form. Is the
alternative form of substring deprecated or just missing from the
documentation?
Thanks
Thom Brown
Twitter: @darkixion
IRC (freenode): dark_ixion
Registered Linux user: #516935
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