Re: Where to get column length

Chris Hoover wrote:
> I know it is in the docs, but right now I can't see it.
>
> How do I pull the length of a specific varchar column?  I have just found a
> problem with our schema being out of sync on one specific column, and need
> to find out how many of our 200+ databases need to be fixed.
>
> Here is what I have so far:
> select *
> from pg_class, pg_attribute
> where pg_class.relkind = 'r' and
> pg_attribute.attrelid = pg_class.oid and
> pg_class.relname = 'mytable' and
> pg_attribute.attname = 'problem_column' and
> ???? != 256;  -- need to report anytime this column is not a varchar(256).

pg_attribute.atttypmod <> 256 + 4

(your 256 plus fixed 4 bytes of overhead for all variable length
attributes).

--
Alvaro Herrera                                http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.