Thread: recursively isolate pedigrees, based only on person_id, mother_id and father_id
Hello! Given a table "persons", where the individuals are bound to each other only via the foreign keys mother_id and father_id as self joins on persons, like that create table persons ( id serial primary key, sex character(1), father_id integer default null references persons(id) on update cascade on delete set null, mother_id integer default null references persons(id) on update cascade on delete set null ); INSERT INTO persons(id, sex, father_id,mother_id) VALUES(1,'m',null,null); INSERT INTO persons(id, sex, father_id,mother_id) VALUES(2,'f',null,null); INSERT INTO persons(id, sex, father_id,mother_id) VALUES(8,'m',null,null); INSERT INTO persons(id, sex, father_id,mother_id) VALUES(9,'f',null,null); INSERT INTO persons(id, sex, father_id,mother_id) VALUES(3,'m',1,2); INSERT INTO persons(id, sex, father_id,mother_id) VALUES(4,'f',8,9); INSERT INTO persons(id, sex, father_id,mother_id) VALUES(5,'f',3,4); INSERT INTO persons(id, sex, father_id,mother_id) VALUES(6,'m',3,4); INSERT INTO persons(id, sex, father_id,mother_id) VALUES(7,'m',8,9); INSERT INTO persons(id, sex, father_id,mother_id) VALUES(10,'m',null,null); INSERT INTO persons(id, sex, father_id,mother_id) VALUES(11,'m',10,5); INSERT INTO persons(id, sex, father_id,mother_id) VALUES(12,'f',7,5); -- consanguinity INSERT INTO persons(id, sex, father_id,mother_id) VALUES(100,'m',null,null); INSERT INTO persons(id, sex, father_id,mother_id) VALUES(200,'f',null,null); INSERT INTO persons(id, sex, father_id,mother_id) VALUES(300,'m',100,200); INSERT INTO persons(id, sex, father_id,mother_id) VALUES(400,'f',null,null); INSERT INTO persons(id, sex, father_id,mother_id) VALUES(500,'f',300,400); These would be the graphs of the 2 families: http://www.nabble.com/file/p25191664/family1.jpg http://www.nabble.com/file/p25191664/family2.jpg I hoped to find a recursive SQL or function, which would extract the WHOLE family of any given person.id from the table with many families. After failing to accomplish this with a recursive SQL I found on the web an advice from Celko (???) http://www.eggheadcafe.com/conversation.aspx?messageid=29498840&threadid=29498808 to better keep away form such things... :( Did someone gathered a closer expertise to that? Thank you very much for any hint! Regards Rawi -- View this message in context: http://www.nabble.com/recursively-isolate-pedigrees%2C-based-only-on-person_id%2C-mother_id-and-father_id-tp25191664p25191664.html Sent from the PostgreSQL - sql mailing list archive at Nabble.com.
Re: recursively isolate pedigrees, based only on person_id, mother_id and father_id
From
Rob Sargent
Date:
On the assumption that you wish to generate the pedigrees for analysis or charting, why not perform the recursion in those layers (or their supporting software), This does not require a large number of sql calls since using an in-clause each call will gather one generation (ascending or descending) for all new persons retrieved in any iteration. How deep are your pedigrees and what is their typical size? rawi wrote: > Hello! > > Given a table "persons", where the individuals are bound to each other only > via the foreign keys mother_id and father_id as self joins on persons, like > that > > create table persons ( > id serial primary key, > sex character(1), > father_id integer default null references persons(id) on update cascade on > delete set null, > mother_id integer default null references persons(id) on update cascade on > delete set null > ); > > INSERT INTO persons(id, sex, father_id,mother_id) VALUES(1,'m',null,null); > INSERT INTO persons(id, sex, father_id,mother_id) VALUES(2,'f',null,null); > INSERT INTO persons(id, sex, father_id,mother_id) VALUES(8,'m',null,null); > INSERT INTO persons(id, sex, father_id,mother_id) VALUES(9,'f',null,null); > INSERT INTO persons(id, sex, father_id,mother_id) VALUES(3,'m',1,2); > INSERT INTO persons(id, sex, father_id,mother_id) VALUES(4,'f',8,9); > INSERT INTO persons(id, sex, father_id,mother_id) VALUES(5,'f',3,4); > INSERT INTO persons(id, sex, father_id,mother_id) VALUES(6,'m',3,4); > INSERT INTO persons(id, sex, father_id,mother_id) VALUES(7,'m',8,9); > INSERT INTO persons(id, sex, father_id,mother_id) VALUES(10,'m',null,null); > INSERT INTO persons(id, sex, father_id,mother_id) VALUES(11,'m',10,5); > INSERT INTO persons(id, sex, father_id,mother_id) VALUES(12,'f',7,5); -- > consanguinity > INSERT INTO persons(id, sex, father_id,mother_id) VALUES(100,'m',null,null); > INSERT INTO persons(id, sex, father_id,mother_id) VALUES(200,'f',null,null); > INSERT INTO persons(id, sex, father_id,mother_id) VALUES(300,'m',100,200); > INSERT INTO persons(id, sex, father_id,mother_id) VALUES(400,'f',null,null); > INSERT INTO persons(id, sex, father_id,mother_id) VALUES(500,'f',300,400); > > These would be the graphs of the 2 families: > http://www.nabble.com/file/p25191664/family1.jpg > http://www.nabble.com/file/p25191664/family2.jpg > > I hoped to find a recursive SQL or function, which would extract the WHOLE > family of any given person.id from the table with many families. > > After failing to accomplish this with a recursive SQL I found on the web an > advice from Celko (???) > http://www.eggheadcafe.com/conversation.aspx?messageid=29498840&threadid=29498808 > to better keep away form such things... :( > > Did someone gathered a closer expertise to that? > > Thank you very much for any hint! > Regards > Rawi >