Patrick Welche a écrit:
> On Fri, Jul 12, 2002 at 09:38:39AM +0200, frbn wrote:
>
>>DELETE FROM custinfo,custinfotemp
>>WHERE
>> custinfo.UserID=custinfotemp.userid
>> and
>> custinfotemp.updateStatus='D'
>>;
>>should avoid the 2.10^6 selects
>
>
> Won't that delete rows from custinfotemp too?
>
> Patrick
no, as this is syntaxically incorrect. oops
I meant:
delete from custinfo
where custinfo.UserID=custinfotemp.userid
and
custinfotemp.updateStatus='D';
---------------------------------------------
explain delete from t1 where t1.c1 = t2.c1;
Merge Join (cost=200000139.66..200000164.66 rows=10000 width=14)
-> Sort (cost=100000069.83..100000069.83 rows=1000 width=10)
-> Seq Scan on t1 (cost=100000000.00..100000020.00 rows=1000 width=10)
-> Sort (cost=100000069.83..100000069.83 rows=1000 width=4)
-> Seq Scan on t2 (cost=100000000.00..100000020.00 rows=1000 width=4)
ps: An interesting notice in the errlog:
NOTICE: Adding missing FROM-clause entry for table "t2"
I don't know how to remove this *non*enoying notice :)
