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* Get max value from an comma separated string
@ 2006-05-29 11:22 Mauro Bertoli <bertolima@yahoo.it>
0 siblings, 2 replies; 3+ messages in thread
From: Mauro Bertoli @ 2006-05-29 11:22 UTC (permalink / raw)
To: pgsql-sql
Hi, I've a field that contain values-comma-separated
like
A) 1;2;3;;5 -- ;2;;4;5
but also
B) 12;34;18
how I can get the max value?
For A I tried:
SELECT max(array_upper(string_to_array(answer,';'),1))
FROM values;
and work fine, but for B case I don't find a solution
like
SELECT max(string_to_array(answer,';')) FROM values;
Any ideas?
Thanks for any hint
Chiacchiera con i tuoi amici in tempo reale!
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^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: Get max value from an comma separated string
@ 2006-06-05 02:12 Bruno Wolff III <bruno@wolff.to>
parent: Mauro Bertoli <bertolima@yahoo.it>
1 sibling, 0 replies; 3+ messages in thread
From: Bruno Wolff III @ 2006-06-05 02:12 UTC (permalink / raw)
To: Mauro Bertoli <bertolima@yahoo.it>; +Cc: pgsql-sql
On Mon, May 29, 2006 at 13:22:38 +0200,
Mauro Bertoli <bertolima@yahoo.it> wrote:
> Hi, I've a field that contain values-comma-separated
> like
> A) 1;2;3;;5 -- ;2;;4;5
> but also
> B) 12;34;18
> how I can get the max value?
> For A I tried:
> SELECT max(array_upper(string_to_array(answer,';'),1))
> FROM values;
> and work fine, but for B case I don't find a solution
> like
> SELECT max(string_to_array(answer,';')) FROM values;
>
> Any ideas?
> Thanks for any hint
Don't store the data like that in the database if possible.
^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: Get max value from an comma separated string
@ 2006-06-05 14:49 Bricklen Anderson <banderson@presinet.com>
parent: Mauro Bertoli <bertolima@yahoo.it>
1 sibling, 0 replies; 3+ messages in thread
From: Bricklen Anderson @ 2006-06-05 14:49 UTC (permalink / raw)
To: Mauro Bertoli <bertolima@yahoo.it>; +Cc: pgsql-sql
Mauro Bertoli wrote:
> Hi, I've a field that contain values-comma-separated
> like
> A) 1;2;3;;5 -- ;2;;4;5
> but also
> B) 12;34;18
> how I can get the max value?
> For A I tried:
> SELECT max(array_upper(string_to_array(answer,';'),1))
> FROM values;
> and work fine, but for B case I don't find a solution
> like
> SELECT max(string_to_array(answer,';')) FROM values;
>
> Any ideas?
> Thanks for any hint
>
You could try rearranging the values into rows, like so:
CREATE OR REPLACE FUNCTION text2rows (TEXT,TEXT) RETURNS SETOF TEXT AS $$
SELECT (string_to_array($1, $2))[x.i]
FROM generate_series(1,array_upper(string_to_array($1,$2),1)) AS x(i);
$$ language sql strict;
select max(val)
from (SELECT text2rows(answer,';') as val FROM answer) as t;
^ permalink raw reply [nested|flat] 3+ messages in thread
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2006-05-29 11:22 Get max value from an comma separated string Mauro Bertoli <bertolima@yahoo.it>
2006-06-05 02:12 ` Bruno Wolff III <bruno@wolff.to>
2006-06-05 14:49 ` Bricklen Anderson <banderson@presinet.com>
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