From: | Thomas Lockhart <lockhart(at)alumni(dot)caltech(dot)edu> |
---|---|
To: | He weiping <laser(at)zhengmai(dot)com(dot)cn> |
Cc: | pgsql-general(at)postgresql(dot)org, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: [HACKERS] is it a bug? |
Date: | 2000-11-28 14:48:21 |
Message-ID: | 3A23C5B5.1D15C59@alumni.caltech.edu |
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Thread: | |
Lists: | pgsql-general pgsql-hackers |
> ... it seems the "lpad", "rpad" don't work,
> when I type:
> select lpad('laser', 4, 'a');
> in psql, the result is still
> 'laser', the same with 'rpad',
> Is it a bug or I'm mis-understaning the lpad and/or rpad functions?
A simple misunderstanding. The length argument is for the *total*
length. So padding a 5 character string to a length of 4 will do
nothing. But padding to a length of 6 will add a single "a" to the
string.
- Thomas
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