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* sort text field numerically
@ 2002-05-14 12:23 Frank Morton <fmorton@base2inc.com>
0 siblings, 1 reply; 2+ messages in thread
From: Frank Morton @ 2002-05-14 12:23 UTC (permalink / raw)
To: pgsql-sql
I have a table with a column called "weight" that
is a text field, but in this case, contains float values,
such as ".8" or "0.25". Might also be null.
How can I sort them in numeric order instead of
textual order? Thanks.
^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: sort text field numerically
@ 2002-05-14 12:43 Joel Burton <joel@joelburton.com>
parent: Frank Morton <fmorton@base2inc.com>
0 siblings, 0 replies; 2+ messages in thread
From: Joel Burton @ 2002-05-14 12:43 UTC (permalink / raw)
To: Frank Morton <fmorton@base2inc.com>; pgsql-sql
> -----Original Message-----
> From: pgsql-sql-owner@postgresql.org
> [mailto:pgsql-sql-owner@postgresql.org]On Behalf Of Frank Morton
> Sent: Tuesday, May 14, 2002 8:24 AM
> To: pgsql-sql@postgresql.org
> Subject: [SQL] sort text field numerically
>
>
> I have a table with a column called "weight" that
> is a text field, but in this case, contains float values,
> such as ".8" or "0.25". Might also be null.
>
> How can I sort them in numeric order instead of
> textual order? Thanks.
select * from floats_table order by text_float_field::float;
will work, as long as there are no non-float items in the table (if there
are, you could use an ORDER BY CASE ... to look for non-numeric characters
and sort these differently, and sort the rest by converting to floats as
::float)
HTH.
Joel BURTON | joel@joelburton.com | joelburton.com | aim: wjoelburton
Knowledge Management & Technology Consultant
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2002-05-14 12:23 sort text field numerically Frank Morton <fmorton@base2inc.com>
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