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Re: compare table names

From: Brice André <brice(at)famille-andre(dot)be>
To: Adrian Klaver <adrian(dot)klaver(at)gmail(dot)com>
Cc: Tony Capobianco <tcapobianco(at)prospectiv(dot)com>, pgsql-sql(at)postgresql(dot)org
Subject: Re: compare table names
Date: 2012-01-11 06:43:10
Message-ID: CAOBG12k-r04ZDyxbV5ACEz_vSJJ1aTDZ1UxfYqE272k04niG+w@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-sql
Just my 2 cents...

Why don't you use a date column type instead of a string ? In this case, at
insertion, you could simply do this :

INERT INTO tablename (insertion_time, ...) VALUES (now(), ...)

and, for the select, you could simply write :

SELECT * FROM tablename WHERE insertion_time >= (now() - interval '1 day')



2012/1/9 Adrian Klaver <adrian(dot)klaver(at)gmail(dot)com>

> On Monday, January 09, 2012 8:28:43 am Tony Capobianco wrote:
> > I see what you're saying:
> >
> > pg=# select tablename from pg_tables where tablename like 'tmp_staging%'
> > and tablename < 'tmp_staging1230' and tablename > 'tmp_staging1228';
> > tablename
> > --------------------
> >  tmp_staging1229
> >
> >
> > This query is part of a larger script where I want to dynamically select
> > tablenames older than 10 days and drop them.  The tables are created in
> > a tmp_stagingMMDD format.  I know postgres does not maintain object
> > create times, how can I write this to select tables from pg_tables that
> > are older than 10 days?
>
> Well with out a year number(i.e. YYMMDD) that is going to be difficult
> around the
> year break.
>
> As an example:
>
> test(5432)aklaver=>select * from name_test;
>       fld_1
> -----------------
>  tmp_staging0109
>  tmp_staging0108
>  tmp_staging1229
> (3 rows)
>
> test(5432)aklaver=>SELECT fld_1 from name_test where fld_1 <
> 'tmp_staging'||
> to_char(current_date-interval '10 days','MMDD') and fld_1 >
> 'tmp_staging0131';
>      fld_1
> -----------------
>  tmp_staging1229
>
>
>
> >
> > Thanks.
> > Tony
> >
>
>
> --
> Adrian Klaver
> adrian(dot)klaver(at)gmail(dot)com
>
> --
> Sent via pgsql-sql mailing list (pgsql-sql(at)postgresql(dot)org)
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