SQL for QA — 100 Queries and Practice Problems

Published by SoftwareTestPilot

PDF • 23 pages • Workbook • Beginner to Advanced • SQL for QA

Published 21 September 2026 • Updated 22 September 2026

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Overview

For each problem, first identify the business rule, the tables involved, the join keys, the expected invariant, and what result would prove a defect. Then write or adapt the query. Sample Practice Schema Table Important columns users id, email, name, status, created_at, last_login_at products id, sku, name, category, price, active orders id, user_id, stat

What you'll learn

Retrieval, filtering and sorting
NULLs, duplicates and data quality
Joins and relationship validation
Aggregation, metrics and reconciliation
Subqueries, CTEs and window functions
API and backend validation with SQL

Topics covered

sql
api-testing

1. Retrieval, Filtering & Sorting - 12 queries
2. NULLs, Duplicates & Data Quality - 12 queries
3. Joins & Relationship Validation - 14 queries
4. Aggregation, Metrics & Reconciliation - 14 queries
5. Dates, Status Flows & Time-Based Checks - 12 queries
6. Subqueries & CTEs for QA Investigation - 10 queries
7. Window Functions for Advanced QA Checks - 10 queries
8. API & Backend Validation with SQL - 8 queries
9. Query Troubleshooting & Performance Awareness - 4 queries
10. Production-Style QA Investigation Patterns - 4 queries
Practice Problems - 25 hands-on challenges
Rapid Revision Sheet - SQL patterns every QA should know

Preview from this resource

How to Use This Workbook

Do not memorize these queries blindly. For each problem, first identify the business rule, the tables involved, the join keys, the expected invariant, and what result would prove a defect. Then write or adapt the

GROUP BY LOWER(email)

HAVING COUNT(*) > 1; QA takeaway: Normalize case if the business treats email as case-insensitive. 15. Find duplicate SKUs QA scenario: Verify SKU uniqueness. SELECT sku, COUNT(*) AS

A short extract taken from the first 6 of 23 pages. The complete notes are in the QA Vault.

Tools covered

Skills covered

SQL for QA

Who this resource is for

Fresher
Manual Tester
Automation Tester
QA Engineer

SQL for QA — 100 Queries and Practice Problems: common questions

1.What does SQL for QA — 100 Queries and Practice Problems cover?

It covers 1. Retrieval, Filtering & Sorting - 12 queries, 2. NULLs, Duplicates & Data Quality - 12 queries, 3. Joins & Relationship Validation - 14 queries, 4. Aggregation, Metrics & Reconciliation - 14 queries, 5. Dates, Status Flows & Time-Based Checks - 12 queries and more.

2.How long is this PDF and what format is it in?

It is a 23-page PDF you can read on any phone, tablet or laptop.

3.Who is this resource for?

Fresher, Manual Tester, Automation Tester, QA Engineer.

4.How do I get the full PDF?

It is included in the QA Notes Vault. After a one-time Vault purchase you can download it, and every other Vault resource, from this page.

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