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* Re: how can I get the length of columns of a table by system tables/views
@ 2011-09-09 12:53 shuaixf <shuaixf@gmail.com>
2011-09-10 05:51 ` Re: Re: how can I get the length of columns of a table by system tables/views msi77 <msi77@yandex.ru>
0 siblings, 1 reply; 2+ messages in thread
From: shuaixf @ 2011-09-09 12:53 UTC (permalink / raw)
To: pgsql-sql
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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^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: Re: how can I get the length of columns of a table by system tables/views
2011-09-09 12:53 Re: how can I get the length of columns of a table by system tables/views shuaixf <shuaixf@gmail.com>
@ 2011-09-10 05:51 ` msi77 <msi77@yandex.ru>
0 siblings, 0 replies; 2+ messages in thread
From: msi77 @ 2011-09-10 05:51 UTC (permalink / raw)
To: shuaixf <shuaixf@gmail.com>; +Cc: pgsql-sql
Why not to use information schema:
select column_name, character_maximum_length from information_schema.columns where table_name ='table name'
09.09.2011, 16:53, "shuaixf" <shuaixf@gmail.com>:
> 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;
>
> --
> View this message in context: http://postgresql.1045698.n5.nabble.com/how-can-I-get-the-length-of-columns-of-a-table-by-system-tab...
> Sent from the PostgreSQL - sql mailing list archive at Nabble.com.
>
> --
> Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org)
> To make changes to your subscription:
> http://www.postgresql.org/mailpref/pgsql-sql
^ permalink raw reply [nested|flat] 2+ messages in thread
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2011-09-09 12:53 Re: how can I get the length of columns of a table by system tables/views shuaixf <shuaixf@gmail.com>
2011-09-10 05:51 ` msi77 <msi77@yandex.ru>
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