Skip to main content

Expression Transformation Interview Question ( Part - 1)

By

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
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 physical ordering in the expression).

Last - all output expressions are executed to push values to output ports
Labels:

Comments

Post a Comment

Popular posts from this blog

Contact Me

By
Do You have any queries ?                   If you are having any query or wishing to get any type of help related Datawarehouse, OBIEE, OBIA, OAC then please e-email on below. I will reply to your email within 24 hrs. If I didn’t reply to you within 24 Hrs., Please be patience, I must be busy in some work. kashif7222@gmail.com
3 comments
Read more

Top 130 SQL Interview Questions And Answers

By
1. Display the dept information from department table.   Select   *   from   dept; 2. Display the details of all employees   Select * from emp; 3. Display the name and job for all employees    Select ename ,job from emp; 4. Display name and salary for all employees.   Select ename   , sal   from emp;   5. Display employee number and total salary   for each employee. Select empno, sal+comm from emp; 6. Display employee name and annual salary for all employees.   Select empno,empname,12*sal+nvl(comm,0) annualsal from emp; 7. Display the names of all employees who are working in department number 10   Select ename from emp where deptno=10; 8. Display the names of all employees working as   clerks and drawing a salary more than 3000   Select ename from emp where job=’clerk’and sal>3000; 9. Display employee number and names for employees who earn commissi...
32 comments
Read more

Informatica sample project

By
Informatica sample project - 1 CareFirst – Blue Cross Blue Shield, Maryland (April 2009 – Current) Senior ETL Developer/Lead Model Office DWH Implementation (April 2009 – Current) CareFirst Blue Cross Blue Shield is one of the leading health care insurance provided in Atlantic region of United States covering Maryland, Delaware and Washington DC. Model Office project was built to create data warehouse for multiple subject areas including Members, Claims, and Revenue etc. The project was to provide data into EDM and to third party vendor (Verisk) to develop cubes based on data provided into EDM. I was responsible for analyzing source systems data, designing and developing ETL mappings. I was also responsible for coordinating testing with analysts and users. Responsibilities: ·          Interacted with Data Modelers and Business Analysts to understand the requirements and the impact of the ETL on the business. ·  ...
Post a Comment
Read more