BTW: Have just tried clean (without any foreign keys constraints)
peformance of
delete from tbl where field not in (select)
vs
create temporary table tmp(id) as select distinct field from tbl; delete
from tmp where id in (select); delete from tbl where field in (select id
from tmp).
both tbl and
OK, I did try you proposal and correlated subselect.
I have a database ~90 companies.
First try was to remove randomly selected 1000 companies
Uncorrelated subselect: 65899ms
Correlated subselect: 97467ms
using: 9605ms
my way: 104979ms. (without constraints recreate)
My is the worst because it
Hi,
Maybe you can try this syntax. I'm not sure, but it eventually perform better:
delete from company_alias USING comprm
where company_alias.company_id =comprm.id
Cheers,
Marc
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To make changes to your
Hello.
I have a database with company table that have a bunch of related
(delete=cascade) tables.
Also it has 1-M relation to company_descr table.
Once we've found that ~half of our companies do not have any description and
we would like to remove them.
First this I've tried was
delete from
=?ISO-8859-5?B?svbi0Nv22SDC2Nzn2OjY3Q==?= [EMAIL PROTECTED] writes:
delete from company where id not in (select company_id from company_descr);
I've tried to analyze command, but unlike to other RDBM I've used it did not
include cascade deletes/checks into query plan. That is first problem.
It
2008/10/2 Tom Lane [EMAIL PROTECTED]
=?ISO-8859-5?B?svbi0Nv22SDC2Nzn2OjY3Q==?= [EMAIL PROTECTED] writes:
delete from company where id not in (select company_id from
company_descr);
I've tried to analyze command, but unlike to other RDBM I've used it did
not
include cascade deletes/checks
