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SQL Override and Lookup Override

What is the difference between SQL Override and Lookup Override
Asked by: purushotham.dwh | Member Since Apr-2008 | Asked on: Apr 6th, 2008

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Mamta11

Answered On : Jul 26th, 2008

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

  
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raj_infadev

Answered On : Oct 13th, 2008

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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 it3. SQL Override can provide any kind of join by writing the query    Lookup Override provides only Non-Equi joins4. 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....RegardsRaj

  
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