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* how to concatenate in PostgreSQL
@ 2012-03-24 11:43 Rehan Saleem <pk_rehan@yahoo.com>
0 siblings, 3 replies; 6+ messages in thread
From: Rehan Saleem @ 2012-03-24 11:43 UTC (permalink / raw)
To: pgsql-sql
hi ,
how can we concatinate these lines and execute sql command
setsql ='select user,username,
firstname '
set sql +=' lastname, cardno from table1where userid='+ 5
exec(sqi)
where 5 is the userid from table1
thanks
^ permalink raw reply [nested|flat] 6+ messages in thread
* Re: how to concatenate in PostgreSQL
@ 2012-03-24 11:57 Andreas Kretschmer <akretschmer@spamfence.net>
parent: Rehan Saleem <pk_rehan@yahoo.com>
2 siblings, 1 reply; 6+ messages in thread
From: Andreas Kretschmer @ 2012-03-24 11:57 UTC (permalink / raw)
To: pgsql-sql
Rehan Saleem <pk_rehan@yahoo.com> wrote:
> hi ,
> how can we concatinate these lines and execute sql command
>
> set sql = 'select user,username, firstname '
> set sql += ' lastname, cardno from table1 where userid=' + 5
sql = sql || ' bla fasel';
|| is the concat - Operator.
Andreas
--
Really, I'm not out to destroy Microsoft. That will just be a completely
unintentional side effect. (Linus Torvalds)
"If I was god, I would recompile penguin with --enable-fly." (unknown)
Kaufbach, Saxony, Germany, Europe. N 51.05082°, E 13.56889°
^ permalink raw reply [nested|flat] 6+ messages in thread
* Re: how to concatenate in PostgreSQL
@ 2012-03-24 13:42 Allan Kamau <kamauallan@gmail.com>
parent: Andreas Kretschmer <akretschmer@spamfence.net>
0 siblings, 0 replies; 6+ messages in thread
From: Allan Kamau @ 2012-03-24 13:42 UTC (permalink / raw)
To: pgsql-sql
On 3/24/12, Andreas Kretschmer <akretschmer@spamfence.net> wrote:
> Rehan Saleem <pk_rehan@yahoo.com> wrote:
>
>> hi ,
>> how can we concatinate these lines and execute sql command
>>
>> set sql = 'select user,username, firstname '
>> set sql += ' lastname, cardno from table1 where userid=' + 5
>
> sql = sql || ' bla fasel';
>
> || is the concat - Operator.
>
>
>
> Andreas
> --
> Really, I'm not out to destroy Microsoft. That will just be a completely
> unintentional side effect. (Linus Torvalds)
> "If I was god, I would recompile penguin with --enable-fly." (unknown)
> Kaufbach, Saxony, Germany, Europe. N 51.05082°, E 13.56889°
>
> --
> Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org)
> To make changes to your subscription:
> http://www.postgresql.org/mailpref/pgsql-sql
>
You may want to ensure that none of variables to be concatenated is
NULL, else the end result will be NULL.
"coalesce" function provides means to provide an substitute value for
a variable that may be NULL.
Allan.
^ permalink raw reply [nested|flat] 6+ messages in thread
* Re: how to concatenate in PostgreSQL
@ 2012-03-26 10:15 Robins Tharakan <robins.tharakan@comodo.com>
parent: Rehan Saleem <pk_rehan@yahoo.com>
2 siblings, 0 replies; 6+ messages in thread
From: Robins Tharakan @ 2012-03-26 10:15 UTC (permalink / raw)
To: pgsql-sql
Hi,
Probably you're looking for these set of articles.
http://wiki.postgresql.org/wiki/Converting_from_other_Databases_to_PostgreSQL#Microsoft_SQL_Server
The second article (by Ethan) has good small hints for things such as
the query that you ask in this thread, when migrating from MSSQL to
PostgreSQL.
--
Robins
On 03/24/2012 05:13 PM, Rehan Saleem wrote:
> hi ,
> how can we concatinate these lines and execute sql command
> setsql = 'select user,username, firstname '
> set sql += ' lastname, cardno from table1 where userid=' + 5
> exec(sqi)
> where 5 is the userid from table1
> thanks
>
Attachments:
[application/pkcs7-signature] smime.p7s (5.0K, ../../4F7041B7.2040108@comodo.com/2-smime.p7s)
download
^ permalink raw reply [nested|flat] 6+ messages in thread
* Re: how to concatenate in PostgreSQL
@ 2012-03-26 16:08 Steve Crawford <scrawford@pinpointresearch.com>
parent: Rehan Saleem <pk_rehan@yahoo.com>
2 siblings, 1 reply; 6+ messages in thread
From: Steve Crawford @ 2012-03-26 16:08 UTC (permalink / raw)
To: pgsql-sql
On 03/24/2012 04:43 AM, Rehan Saleem wrote:
> hi ,
> how can we concatinate these lines and execute sql command
In what? Psql? A PL/pgSQL function. C/Java/PHP/Python/Perl/Erlang/Lua?
> setsql = 'select user,username, firstname '
> set sql += ' lastname, cardno from table1 where userid=' + 5
> exec(sqi)
> where 5 is the userid from table1
> thanks
>
Cheers,
Steve
^ permalink raw reply [nested|flat] 6+ messages in thread
* Re: how to concatenate in PostgreSQL
@ 2012-03-27 16:12 Steve Crawford <scrawford@pinpointresearch.com>
parent: Steve Crawford <scrawford@pinpointresearch.com>
0 siblings, 0 replies; 6+ messages in thread
From: Steve Crawford @ 2012-03-27 16:12 UTC (permalink / raw)
To: Rehan Saleem <pk_rehan@yahoo.com>; +Cc: pgsql-sql
On 03/27/2012 07:48 AM, Rehan Saleem wrote:
> well i am quite sure its PostgreSQL forum and it is obvious, i am
> asking this to concatenate in plpgsql.
> ------------------------------------------------------------------------
> *From:* Steve Crawford <scrawford@pinpointresearch.com>
> *To:* pgsql-sql@postgresql.org
> *Sent:* Monday, March 26, 2012 9:08 PM
> *Subject:* Re: [SQL] how to concatenate in PostgreSQL
>
> On 03/24/2012 04:43 AM, Rehan Saleem wrote:
>> hi ,
>> how can we concatinate these lines and execute sql command
> In what? Psql? A PL/pgSQL function. C/Java/PHP/Python/Perl/Erlang/Lua?
>> setsql = 'select user,username, firstname '
>> set sql += ' lastname, cardno from table1 where userid=' + 5
>> exec(sqi)
>> where 5 is the userid from table1
>> thanks
>>
> Cheers,
> Steve
>
>
Yes, after about a decade of PostgreSQL use and forum participation I
think I know which forum this is. Sarcasm and biting at people who want
to help you is not a good way to make friends and get help on the forums.
If you meant PL/pgSQL then say it. It is not the same as SQL though the
syntax is generally similar. Look at DECLARE and BEGIN for starters.
I've seen too many threads get reset back to the start once some
incorrect assumptions get corrected to feel that up-front clarification
is a waste of time.
http://wiki.postgresql.org/wiki/Guide_to_reporting_problems is more
oriented to problem reporting than general questions but has helpful
advice nonetheless.
Back to the issue at hand...others have pointed out the || operator and
the issue with NULL. It appears you are doing a lot of conversion
requiring writing of PL/pgSQL functions. Spend a few minutes skimming:
http://www.postgresql.org/docs/current/static/plpgsql.html
As to the topic of executing the command including many examples see:
http://www.postgresql.org/docs/current/static/plpgsql-statements.html#PLPGSQL-STATEMENTS-EXECUTING-D...
If you are writing functions that must use dynamically generated table
and column names, become familiar with the quote_ident, quote_literal
and quote_nullable functions.
Cheers,
Steve
^ permalink raw reply [nested|flat] 6+ messages in thread
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-- links below jump to the message on this page --
2012-03-24 11:43 how to concatenate in PostgreSQL Rehan Saleem <pk_rehan@yahoo.com>
2012-03-24 11:57 ` Andreas Kretschmer <akretschmer@spamfence.net>
2012-03-24 13:42 ` Allan Kamau <kamauallan@gmail.com>
2012-03-26 10:15 ` Robins Tharakan <robins.tharakan@comodo.com>
2012-03-26 16:08 ` Steve Crawford <scrawford@pinpointresearch.com>
2012-03-27 16:12 ` Steve Crawford <scrawford@pinpointresearch.com>
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