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Date: Fri, 9 Sep 2011 22:45:26 -0700 (PDT)
From: shuaixf <shuaixf@gmail.com>
To: pgsql-admin@postgresql.org
Message-ID: <1315633526507-4788780.post@n5.nabble.com>
In-Reply-To: <1315408840339-4778911.post@n5.nabble.com>
References: <1315408840339-4778911.post@n5.nabble.com>
Subject: Re: how can I get the length of columns of a table by system
	tables/views
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SELECT a.attname, pg_catalog.format_type(a.atttypid, a.atttypmod) 
FROM pg_catalog.pg_attribute a 
WHERE a.attrelid = (SELECT pg_class.oid 
                    FROM pg_class INNER JOIN pg_namespace 
                       ON (pg_class.relnamespace = pg_namespace.oid 
                           AND lower(pg_namespace.nspname) = 'public') 
                   WHERE pg_class.relname='tablename') 
  AND a.attnum > 0 AND NOT a.attisdropped 
ORDER BY a.attnum;

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