On Fri, Nov 17, 2017 at 09:32:23PM +0100, Luca Ferrari wrote:
> Hi all,
> maybe this is trivial, but I need an hint on a way to see a table form
> of the MCVs and MCFs out of pg_stats with a query. Is it possible to
> get a set of rows each with a most common value on one column and the
> corresponding column on the the other? (assuming I can cast the array
> of MCVs to the right type array)

I think you want something like this ?

postgres=# SELECT schemaname, tablename, attname, 
unnest(histogram_bounds::text::text[]), histogram_bounds FROM pg_stats LIMIT 9;
 pg_catalog | pg_pltemplate | tmplname    | plperl              | 
{plperl,plperlu,plpgsql,plpython2u,plpython3u,plpythonu,pltcl,pltclu}
 pg_catalog | pg_pltemplate | tmplname    | plperlu             | 
{plperl,plperlu,plpgsql,plpython2u,plpython3u,plpythonu,pltcl,pltclu}
 pg_catalog | pg_pltemplate | tmplname    | plpgsql             | 
{plperl,plperlu,plpgsql,plpython2u,plpython3u,plpythonu,pltcl,pltclu}
 pg_catalog | pg_pltemplate | tmplname    | plpython2u          | 
{plperl,plperlu,plpgsql,plpython2u,plpython3u,plpythonu,pltcl,pltclu}
 pg_catalog | pg_pltemplate | tmplname    | plpython3u          | 
{plperl,plperlu,plpgsql,plpython2u,plpython3u,plpythonu,pltcl,pltclu}
 pg_catalog | pg_pltemplate | tmplname    | plpythonu           | 
{plperl,plperlu,plpgsql,plpython2u,plpython3u,plpythonu,pltcl,pltclu}
 pg_catalog | pg_pltemplate | tmplname    | pltcl               | 
{plperl,plperlu,plpgsql,plpython2u,plpython3u,plpythonu,pltcl,pltclu}
 pg_catalog | pg_pltemplate | tmplname    | pltclu              | 
{plperl,plperlu,plpgsql,plpython2u,plpython3u,plpythonu,pltcl,pltclu}
 pg_catalog | pg_pltemplate | tmplhandler | plperl_call_handler | 
{plperl_call_handler,plperlu_call_handler,plpgsql_call_handler,plpython2_call_handler,plpython3_call_handler,plpython_call_handler,pltcl_cal
l_handler,pltclu_call_handler}

Justin


-- 
Sent via pgsql-general mailing list (pgsql-general@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-general

Reply via email to