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Showing posts from September, 2015

Expression Transformation Interview Question ( Part - 1)

What is an Expression Transform? Answer: Expression is a Passive connected transformation used to calculate values in a single row before you write to the target. We can use the Expression transformation to perform any non-aggregate calculations. We can al-so use the Expression transformation to test conditional statements before you output the results to target tables or other transformations. For example, we might need to adjust employee salaries, concatenate first and last names, or convert strings to numbers. Expression Transformation Interview Question How many types of ports are there in Expression transform? Answer: There are three types of ports- INPUT, OUTPUT, and VARIABLE What is the execution order of the ports in an expression? Answer: All ports are executed TOP TO BOTTOM in a serial physical ordering fashion, but they are done in the following groups:  All input ports are pushed values first. Then all variables are executed (top to bottom phys

Aggregator Transformation Scenarios in Informatica

Aggregator Transformation In Informatica Scenarios Suppose in our Source Table we have data as given below   Aggregator Transformation In Informatica Scenarios We want to load our Target Table as Aggregator Transformation In Informatica Scenarios Describe your approach. Answer: Here our scenario is to convert many rows to one row, and the transformation which will help us to achieve this is Aggregator. Our Mapping will look like this: Aggregator Transformation In Informatica Scenarios We will sort the source data based on STUDENT_NAME ascending followed by SUBJECT ascending. Aggregator Transformation In Informatica Scenarios Now based on STUDENT_NAME in GROUP BY clause the following output subject columns are populated as    MATHS: MAX( MARKS, SUBJECT = ’Maths’ )    LIFE_SC: MAX( MARKS, SUBJECT = ’Life Science’ )   PHY_SC: MAX( MARKS, SUBJECT = ’Physical Science’ ) Aggregator Transformation In Informatica Scenarios Scenario Implementation 2 Source: