Question
ETL stands for:
More Data Warehousing Questions
- Which type of schema normalizes dimension tables to reduce redundancy?
- What is meant by 'cardinality' in data modeling?
- Which schema in data warehousing uses a central fact table connected to dimension tables?
- What is a 'star schema' in data warehouse design?
- Which SQL query will correctly calculate the average salary of employees in each department and group them by department in a table named 'employees'?
- Surrogate keys are used in data warehouses because:
- ETL stands for:
- Which type of slowly changing dimension (SCD) preserves full history by adding a new row for each change and using effective date ranges?
- What does "drill-down" operation in OLAP do?
- Which SQL clause is used to filter records after aggregation?
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