Chapter 3. Optimizing Your Data Model
Your data model should always be simple and easy to understand. An expert data modeler will always clean up the data model to remove any unnecessary tables.
QlikView provides different techniques for data model cleanup. In this chapter we will learn ways to clean up the data model and create a star schema.
In this chapter we shall:
- Learn about mapping tables and mapping load
- Clean up the data model using "mapping load" and "apply map"
- Learn about different kinds of joins
- Aggregate data
- Learn to use "concatenate"
Let's review the data model that we created in the last chapter:
One of our requirements is to create a robust data model that is clean, easy to understand, and helps in data analysis. This chapter describes techniques to achieve this requirement. By understanding and applying the concepts of mapping load, concatenate, and joins, we can create a more useful data model.
