Major difference between SQL override and Lookup Sql override



Major difference between SQL override and Lookup Sql override..

Answer / ysindhureddy77@gmail.com

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 doesn’t do that.

Is This Answer Correct ?    0 Yes 0 No

Post New Answer

More Informatica Interview Questions

I have a scenario with router transformation. but i dont want to capture records from default group. how can we achieve this.

3 Answers   Amdocs,


delete data from staging table as it loads to target table.here is the case we are getting data from 3 different server.a b and c.the data from server A loaded into staging table and we ran the task and data loaded to target table.now today data from server B and C also got loaded to the staging table.now what techniques and what transformations should be used to delete only the data which has been loaded only to the target.we need to delete only that data from staging which has been loaded into the target.looking for your responses

2 Answers   Motorola,


i have a source table and 3 target table. when session runs first time-1st tgt second time-2nd tgt third time-3rd tgt fourth time-again 1st target. so no

4 Answers   HCL,


what is incremental loading ?

12 Answers   CTS, IBM, Oracle, TCS,


If you have 10 mappings designed and you need to implement some chages (may be in existing mapping or new mapping need to be designed) then how much time it takes from easier to complex?

1 Answers  






What is rank transformation?

0 Answers  


What are the session parameters?

3 Answers  


What is the difference between source qualifier transformations source filter to filter transformation?

0 Answers  


i have a wf like wf-->s1-->s2-->s3-->s4 first start s1 later s2 later s3 here my session s3 have to run 3 times later start s4?

3 Answers   IBM,


Different types of Power center errors?

1 Answers   Cinterco, IBM,


If we can implement SCD TYPE 1 AND 2 IN A SINGLE MAPPING.. CAN WE SEE THE RESULT IN A SINGLE OUTPUT? I MEAN I WANT THE RELSULT OF BOTH SCD 1 AND 2 TO BE SEEN IN A SINGLE RUN?

1 Answers   TCS,


Hi, In a mapping I have 3 targets and one fixed width file as source. Total 193 records are there . I connected one port in aggregator to all 3 targets. The same value need to be load into these 3 targets . It is loaded like that only but in different order. Why? The order of insertion should be same know for all 3 targets ? Then why the order is changed ? Any one please help me. Advance thanks.

3 Answers   IBM,


Categories