INTERVIEW QUESTIONS DATA WAREHOUSING INFORMATICA DETAILS

Question: How can you delete duplicate rows with out using Dynamic Lookup? Tell me any other ways using lookup delete the duplicate rows?

Answer: For example u have a table Emp_Name and it has two columns Fname, Lname in the source table which has douplicate rows. In the mapping Create Aggregator transformation. Edit the aggregator transformation select Ports tab select Fname then click the check box on GroupBy and uncheck the (O) out port. select Lname then uncheck the (O) out port and click the check box on GroupBy. Then create 2 new ports Uncheck the (I) import then click Expression on each port. In the first new port Expression type Fname. Then second Newport type Lname. Then close the aggregator transformation link to the target table.

For example u have a table Emp_Name and it has two columns Fname, Lname in the source table which has douplicate rows. In the mapping Create Aggregator transformation. Edit the aggregator transformation select Ports tab select Fname then click the check box on GroupBy and uncheck the (O) out port. select Lname then uncheck the (O) out port and click the check box on GroupBy. Then create 2 new ports Uncheck the (I) import then click Expression on each port. In the first new port Expression type Fname. Then second Newport type Lname. Then close the aggregator transformation link to the target table.


Source: CoolInterview.com

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