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@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 functionsResult data type |   Schema   |    Name    |     Argument data types
------------------+------------+------------+---------------------------------------------void             | pg_catalog
|alt_to_iso | integer, integer, cstring, ... 
 
(1 row)


HTH,
stefan weiss