SQL Thinking for a BA

Think in entities and relationships

Before writing SQL, identify the business entities: customers, orders, products, payments, subscriptions. Then understand how they relate.

Common BA use cases

• Find customers with no order in the last 90 days.
• Compare revenue by product category.
• Identify duplicate records.
• Measure order-processing time.
• Find failed transactions by reason.

SQL is not just a technical skill. It gives a BA a way to test assumptions with evidence.