Re: \df

On Saturday, 08 May 2004 01:15, Jie Liang wrote:
> What sql statement equal to \df function_name
> I want to know the result data type for a given function within plpgsql.

Try the -E switch for pgsql:

spaceman(at)weyoun:~ $ psql -E
Welcome to psql 7.4.2, the PostgreSQL interactive terminal.

Type: \copyright for distribution terms
\h for help with SQL commands
\? for help on internal slash commands
\g or terminate with semicolon to execute query
\q to quit

spaceman=# \df alt_to_iso

********* QUERY **********
SELECT CASE WHEN p.proretset THEN 'setof ' ELSE '' END ||
pg_catalog.format_type(p.prorettype, NULL) as "Result data type",
n.nspname as "Schema",
p.proname as "Name",
pg_catalog.oidvectortypes(p.proargtypes) as "Argument data types"
FROM pg_catalog.pg_proc p
LEFT JOIN pg_catalog.pg_namespace n ON n.oid = p.pronamespace
WHERE p.prorettype <> 'pg_catalog.cstring'::pg_catalog.regtype
AND p.proargtypes[0] <> 'pg_catalog.cstring'::pg_catalog.regtype
AND NOT p.proisagg
AND pg_catalog.pg_function_is_visible(p.oid)
AND p.proname ~ '^alt_to_iso$'
ORDER BY 2, 3, 1, 4;
**************************

List of functions
Result data type | Schema | Name | Argument data types
------------------+------------+------------+---------------------------------------------
void | pg_catalog | alt_to_iso | integer, integer, cstring, ...
(1 row)

HTH,
stefan weiss