Re: how can I get the length of columns of a table by system tables/views

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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