From: | Stephan Szabo <sszabo(at)megazone23(dot)bigpanda(dot)com> |
---|---|
To: | Natasa Bulatovic <n(dot)bulatovic(at)zim(dot)mpg(dot)de> |
Cc: | <pgsql-sql(at)postgresql(dot)org> |
Subject: | Re: Any limitation in size for return result from SELECT? |
Date: | 2003-03-02 03:03:03 |
Message-ID: | 20030301190150.E21955-100000@megazone23.bigpanda.com |
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Thread: | |
Lists: | pgsql-sql |
On Tue, 25 Feb 2003, Natasa Bulatovic wrote:
> Select statement returns as a result concatenated all varchar, text
> and char columns of a table as one single column ...
>
> select col1||col2||col3||.....||col100 from table
>
> However, when the number of concatenated columns is bigger than 22 no
> result is given back (tested in psql, as well as from pgplsql)....
>
> Most of these columns for the test data are NULL...Datatypes of
> columns are mixed text, varchar, char...Select statement does not
> return any error...Just returns a row with a null result.... Any quick
> suggestions would be very useful....
Anything concatenated with a NULL is NULL. You'll probably want to use
COALESCE(col1,'')||... for each of the columns that can be null.
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