INTERVIEW QUESTIONS DATA WAREHOUSING INFORMATICA DETAILS

Question: Why use the lookup transformation?

Answer: To perform the following tasks:-
Get a related value. For example, if your source table includes employee ID, but you want to include the employee name in your target table to make your summary data
easier to read.
Perform a calculation. Many normalized tables include values used in a calculation, such as gross sales per invoice or sales tax, but not the calculated value (such as net
sales).
Update slowly changing dimension tables. You can use a Lookup transformation to determine whether records already exist in the target.

To perform the following tasks:-
Get a related value. For example, if your source table includes employee ID, but you want to include the employee name in your target table to make your summary data
easier to read.
Perform a calculation. Many normalized tables include values used in a calculation, such as gross sales per invoice or sales tax, but not the calculated value (such as net
sales).
Update slowly changing dimension tables. You can use a Lookup transformation to determine whether records already exist in the target. Source: CoolInterview.com

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