Mastering SQL - PostgreSQL: Pre-defined Functions - Using CASE and WHEN
Learn how to use SQL's CASE and WHEN expressions to implement conditional logic in your queries. In this tutorial, we demonstrate how to rewrite common logic, such as handling NULL values and grouping statuses, using CASE and WHEN instead of other functions like COALESCE. We’ll walk through a practical example where we categorize order statuses into 'completed', 'pending', and 'other'. This video is essential for developers looking to improve their SQL query-writing skills and streamline data processing.
Key Topics Covered:
✔️ Using CASE and WHEN for conditional logic in SQL
✔️ Rewriting COALESCE logic with CASE and WHEN
✔️ Categorizing order statuses based on conditions
✔️ Handling NULLs and string matching with SQL
✔️ Practical SQL examples using PostgreSQL
✔️ Writing clean and efficient conditional queries
Timestamps
0:00 - Introduction to CASE and WHEN in SQL
0:30 - Example: Using CASE and WHEN for order status categorization
1:00 - Rewriting COALESCE logic with CASE and WHEN
2:00 - Working with string patterns in SQL (LIKE, TILDE)
3:00 - Grouping order statuses into categories
4:00 - Distinct values and final output of conditional logic
5:00 - Key takeaways on using CASE and WHEN effectively
5:30 - Conclusion: Why CASE and WHEN are essential in SQL
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