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Phase 5 · SQL & Databases for QA

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Writing Test Queries (SELECT, JOIN)

Part of the QA Testing Roadmap.

Summary

Applying SQL specifically to verify test scenarios — combining data across related tables with JOINs to confirm a complex business rule was applied correctly at the database level.

How to Learn This

  • 1Write a query joining 2 tables to verify a specific business rule (e.g. order totals matching line items).
  • 2Learn the difference between INNER and LEFT JOIN and when each fits a verification scenario.
  • 3Practice writing a query to find data inconsistencies (e.g. orphaned records).

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SQL Fundamentals for Testers

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Database Testing Basics

More topics in SQL & Databases for QA

SQL Fundamentals for TestersDatabase Testing BasicsData Validation TechniquesBackend TestingStored Procedures Testing (Overview)Database Schema ReadingData Integrity Testing
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