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 DataStage  |  Question 171 of 377    Print  
* What are constraints and derivation?

* Explain the process of taking backup in DataStage?

*What are the different types of lookups available in DataStage?

  
Total Answers and Comments: 2 Last Update: May 22, 2006     Asked by: debasis_mohanty 
  
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May 22, 2006 11:41:46   #1  
Venkat        
RE: * What are constraints and derivation?...

Constraints are used to check for a condition and filter the data. Example: Cust_Id<>0 is set as a constraint and it means and only those records meeting this will be processed further.

Derivation is a method of deriving the fields, for example if you need to get some SUM,AVG etc.


 
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May 22, 2006 13:53:00   #2  
venkat        
RE: * What are constraints and derivation?...

Constraints are condition and once meeting those records will be processed further. Example process all records where cust_id<>0.

Derivations are derived expressions.for example I want to do a SUM of Salary or Calculate Interest rate etc


 
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