Home Page for the TeradataForum
 

Archives of the TeradataForum

Message Posted: Wed, 19 Dec 2001 @ 21:56:43 GMT


     
  <Prev Next>   <<First <Prev Next> Last>>  


Subj:   Re: Exists/Not Exists versus IN/Not IN
 
From:   Eric Kohut

Very good review Geoffrey.

You can however, also use a Left Outer Join to accomplish the NOT IN processing and restrict qualification of the resulting rows to only those that have a Null on the join columns (from ON Clause) from the right table.

This is sometimes a faster approach than Not In when the tables have different Primary indexes. It may be more equivalent to Not Exists???

Good Luck,

Eric

EJK
Eric J. Kohut
Senior Solutions Consultant - Teradata Solutions Group - Retail
Certified Teradata Master
NCR Corp.



     
  <Prev Next>   <<First <Prev Next> Last>>  
 
 
 
 
 
 
 
 
  
  Top Home Privacy Feedback  
 
 
Copyright for the TeradataForum (TDATA-L), Manta BlueSky    
Copyright 2016 - All Rights Reserved    
Last Modified: 27 Dec 2016