Writing SQL for Business Stakeholders

Welcome to **Day 59**. Today isn't about code performance. It's about "Stakeholder Management."

If you provide a query that your boss can't read, they won't trust your numbers.

Use CTEs as "Logic Chapters"

Even if you don't *need* a CTE for performance, use them to label your business logic.

WITH active_subscribers AS ( ... ),

revenue_per_region AS ( ... ),

final_projection AS ( ... )

SELECT * FROM final_projection;

If the CFO asks, "How did you calculate the revenue?" you can point to the second CTE and say, "Right here."

Don't comment `JOIN orders (joining to orders)`. That's useless.

Comment the **Business Logic**: `-- We exclude test accounts starting with 'TEST_' as per the 2023 audit rules.`

Use aliases that make sense in English. `SELECT SUM(t) AS total_revenue` is better than `SELECT SUM(t)`.

Take a query and add "Business Comments" explaining *why* you are filtering or joining in a certain way.

*Day 60: Phase 4 Project—Building a Dynamic Monthly Revenue Pipeline.*