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SQL Override and Lookup Override
What is the difference between SQL Override and Lookup Override


  
Total Answers and Comments: 2 Last Update: October 13, 2008     Asked by: purushotham.dwh 
  
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July 26, 2008 17:37:55   #1  
Mamta11 Member Since: July 2008   Contribution: 12    

RE: SQL Override and Lookup Override

If you write a SQL override in lookup transformation its a lookup override.


 
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October 13, 2008 01:12:44   #2  
raj_infadev Member Since: October 2007   Contribution: 5    

RE: SQL Override and Lookup Override
Obviously we have some differences between those 2 Overrides...

1. SQL Override is to limit the number of incoming rows entering the mapping pipeline
Lookup Override is to limit the number of lookup rows to avoid the whole table scan by saving the lookup time & cache it uses...

2. Lookup Override uses "Order By" clause by default
SQL Override doesn't uses it & should provide in our query if we require it

3. SQL Override can provide any kind of join by writing the query
Lookup Override provides only Non-Equi joins

4. Lookup Override gives only one record even if it finds multiple records for a single condition
SQL Override doen't do that...

Let me know if m wrong in any point....

Regards
Raj


 
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