SQL Challenge: Interaction Summary
Calculate the total number of interactions and the total number of contents created for each customer. Include all interaction types and content types in your calculations. Your output should include the customer's ID, the total number of interactions, and the total number of content items.
SQL interviews often test your ability to manipulate and aggregate data efficiently. This challenge from IBM focuses on customer interactions and content creation. Give it a shot and see if you can craft the right query!
Approach Hints
Here are some technical insights to guide you toward solving this question:
- Summarise interactions: Use COUNT(*) to count the number of rows in customer_interactions per customer_id.
- Summarise content: Use COUNT(*) to count the number of rows in user_content per customer_id.
- Handle missing data: Use a FULL OUTER JOIN to include customers who have either interactions or content (or both).
- Replace NULL values: Use COALESCE() to replace NULL counts with 0.
- Order results: Sort the final output by customer_id for readability.
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