That IS NULL is done by replacing the NOT EXISTS operator with an outer join?

DB version: 10 gr 2

An example of searchoracle.target.com

The query that contains a NOT EXISTS operator
SELECT M.ModulId, M.Modul FROM MODULE M
WHERE NOT EXISTS
( SELECT PROJEKTMODUL.IdModul 
  FROM PROJEKTMODUL 
  WHERE M.ModulId = PROJEKTMODUL.IdModul 
  AND PROJEKTMODUL.IdProjekt = 23 )
is replaced by an equivalent outer join query
select distinct
       M.ModulId
     , M.Modul 
  from MODULE M
left outer
  join PROJEKTMODUL
    on M.ModulId = PROJEKTMODUL.IdModul
   and PROJEKTMODUL.IdProjekt = 23
 where PROJEKTMODUL.IdProjekt is null
I do not understand what
PROJEKTMODUL.IdProjekt is null
fact in the above rewritten query.

He is to perform an anti-jointure. As far as I know Oracle (starting with version 10g - I thought that release 1) rewritten a Join Anti that resembles your second query of your request NOT EXISTS and NOT IN.

Look at the results of the query without the predicate IS NULL and see what records (from this set) must be selected to show the same results as the first query. Areas of interest match the predicate IS NULL.

Tags: Database

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