Re: Existencia de columna en tabla

Guido Barosio escribió:

> SELECT a.attname,
> pg_catalog.format_type(a.atttypid, a.atttypmod),
> (SELECT substring(pg_catalog.pg_get_expr(d.adbin, d.adrelid) for 128)
> FROM pg_catalog.pg_attrdef d
> WHERE d.adrelid = a.attrelid AND d.adnum = a.attnum AND a.atthasdef),
> a.attnotnull, a.attnum
> FROM pg_catalog.pg_attribute a
> WHERE a.attrelid = '24588' AND a.attnum > 0 AND NOT a.attisdropped
> ORDER BY a.attnum

Tambien puedes hacerlo asi, mas facil y te evita la consulta a pg_class:

SELECT a.attname,
pg_catalog.format_type(a.atttypid, a.atttypmod),
(SELECT substring(pg_catalog.pg_get_expr(d.adbin, d.adrelid) for 128)
FROM pg_catalog.pg_attrdef d
WHERE d.adrelid = a.attrelid AND d.adnum = a.attnum AND a.atthasdef),
a.attnotnull, a.attnum
FROM pg_catalog.pg_attribute a
WHERE a.attrelid = 'nombre-tabla'::regclass AND a.attnum > 0 AND NOT a.attisdropped
ORDER BY a.attnum

Lo otro es que el motivo para poner pg_attrdef en un subselect y no como
un JOIN es un misterio ...

--
Alvaro Herrera http://www.CommandPrompt.com/
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