Hi, Also you could take a look at the connectby function as this will do what you want with ease and it can be used to sort stuff at the same time, produce tree views of data etc.
Nick -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Gnanavel Shanmugam Sent: 05 July 2005 06:05 To: pgsql-sql@postgresql.org Subject: [SQL] Recursive function Hi, I have a table with the following details. section_type_id | section_type_name | parent_section_type_id -----------------+-------------------+------------------------ 10 | Unit | 20 | Block | 10 30 | Practice | 20 40 | Sub Practice | 30 I've written a function as this CREATE or replace FUNCTION get_child_section_types(int) RETURNS setof int AS $$ declare v_section_type_id alias for $1; v_rec record; begin for v_rec in select section_type_id from master_section_type where parent_section_type_id=v_section_type_id loop return next v_rec.section_type_id; end loop; return; end; $$ LANGUAGE plpgsql; which returns output like, select * from get_child_section_types(10); get_child_section_types ------------------------- 20 but I need the function to return all section types under the child nodes too. So, how to make the function to be recursive. with thanks & regards, S.Gnanavel ---------------------------(end of broadcast)--------------------------- TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match ---------------------------(end of broadcast)--------------------------- TIP 6: Have you searched our list archives? http://archives.postgresql.org
