Comments on: Oracle: Is OUTER JOIN Better Than NOT EXISTS?

By: IN un EXISTS salÄ«dzinÄÅ¡anas operatori « DatubÄzu resurss latviski

IN un EXISTS salÄ«dzinÄÅ¡anas operatori « DatubÄzu resurss latviski — Thu, 08 Jan 2009 07:09:28 +0000

[...] Oracle: Is OUTER JOIN Better Than NOT EXISTS? [...]

Jack McGarry — Thu, 04 Dec 2008 14:28:22 +0000

You can do this and get the same result…

delete
from t1 a
where 0 = (select count(b.id)
from t2 b
where b.id = a.id);

Ash — Fri, 31 Oct 2008 18:27:28 +0000

just stumbled upon this, so maybe useless by now…

Anyway, the delete should be similar to select of the missing records:

select a.id from t1 a left join t2 b on a.id=b.id where b.id is null;

just apply the delete syntax of your DBMS:

delete from t1 a left join t2 b on a.id=b.id where b.id is null;

or in MSAccess:

delete a.* from t1 as a left join t2 as b on a.id=b.id where b.id is null;

hope it helps.

Preetha — Fri, 16 May 2008 11:51:08 +0000

delete from t1 a
where exists
(select 1 from t1 one left outer join t2 two on two.id = one.id where two.id is null);