18. SQL Grouping and Joining

Learning Objectives:

• Use aggregation function to calculate totals or averages in query results.

• Group records to aggregate them in categories.

• Use JOIN to merge tables as part of a query.

• 18.1. Aggregating Data
  • 18.1.1. Counting Unique Values
• 18.2. Grouping
• 18.3. Filtering with Aggregated Results
• 18.4. Joining
• 18.5. Chapter Summary
• 18.6. Chapter Exercises

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