From: | Thom Brown <thom(at)linux(dot)com> |
---|---|
To: | depesz(at)depesz(dot)com |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: How can I get list of views that are using given column in table? |
Date: | 2012-02-20 13:06:29 |
Message-ID: | CAA-aLv5OYF1OX-5irD6uD9z6dU9URaGr5kCP+6i6w6Ap6PDViQ@mail.gmail.com |
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Lists: | pgsql-general |
On 20 February 2012 12:06, hubert depesz lubaczewski <depesz(at)depesz(dot)com> wrote:
> hi
> I have situation, where I need to change datatype of column.
> But when I do:
> alter table xx alter column yy type zz;
> i get error:
> ERROR: cannot alter type of a column used by a view or rule
> DETAIL: rule _RETURN on view some_view depends on column "yy"
>
> how can I get a list of all such views (in a sqlish way, so I could make a
> query to return all needed objects that need to be dropped/recreated).
You could try this:
SELECT distinct dependee.relname
FROM pg_depend
JOIN pg_rewrite ON pg_depend.objid = pg_rewrite.oid
JOIN pg_class as dependee ON pg_rewrite.ev_class = dependee.oid
JOIN pg_class as dependent ON pg_depend.refobjid = dependent.oid
JOIN pg_attribute ON pg_depend.refobjid = pg_attribute.attrelid
AND pg_depend.refobjsubid = pg_attribute.attnum
WHERE dependent.relname = <tablename>
AND pg_attribute.attnum > 0
AND pg_attribute.attname = <columnname>;
--
Thom
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