| |
GeekInterview.com > Interview Questions > Data Warehousing > Informatica
| Print | |
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.
|
| January 01, 2007 02:22:57 |
#3 |
| |
Member Since: Visitor Total Comments: N/A |
RE: Why use the lookup transformation ?
|
| look up has two types ,Connected and Unconnected..Usually we use look-up so as to get the related Value from a table ..it has Input port ,Output Port ,Lookup Port and Return Port..where Lookup Port looks up the corresponding column for the value and resturn port returns the value..usually we use when there are no columns in common |
| |
Back To Question | |
