1. What is SSIS, SSAS, and SSRS? What is the difference between them?

2. What is the difference between SSIS and ETL?

3. Use examples to describe the main steps of coverting ERD to Star Schema?

4. A data warehouse of a telephone provider consists of ve dimensions, namely, caller customer, callee customer, time, call type, and call program, and three measures, namely, number of calls, duration, and amount.
Def ine the OLAP operations to be performed in order to answer the following queries.
1. Total duration of calls made by customers from Brussels in 2012.
2. Total amount collected from customers in Brussels who are enrolled in the corporate program in 2012.

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