QlikView Star Schema Model
In a QlikView star schema model, data is organized into a central fact table surrounded by several dimension tables. The fact table contains the primary data or measures that are being analyzed, while the dimension tables contain data that provides context for the measures in the fact table.
For example, consider a sales data model in QlikView. The fact table might contain sales data such as the date of the sale, the product that was sold, and the quantity and total value of the sale. The dimension tables could include information about the customer who made the purchase, the store where the purchase was made, and the product that was sold.
In a QlikView star schema model, the dimension tables are linked to the fact table using keys, which are used to relate the data in the different tables. The relationships between the tables are represented visually in the QlikView data model using a star diagram, which gives the model its name.
Using a star schema model in QlikView allows users to easily analyze and explore data by drilling down into the details of specific measures and viewing them in the context of the surrounding dimensions. It also helps to improve the performance of QlikView by reducing the amount of data that needs to be loaded into memory and processed.
A sort of data model called a start schema model connects several dimensions to a single fact table. Naturally, larger models may contain several fact tables connected to numerous dimensions and additional fact tables. This model’s value comes from its ability to execute quick queries with few joins between different tables.
The data in the fact table are measurements with numerical values. The fact table’s fields are used as the basis for calculations. Linking the dimension tables to the fat table, which also has a key often with the same field name, uses the distinct keys of the dimension tables. As a result, the Fact table contains all of the dimension table’s keys, creating a concatenated primary key that is used in queries.