Re: compare table names

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