Core Quality EngineeringFoundation 2 hrs

SQL & Data Validation for Testers

Use SQL to verify data state, joins, transformations, duplicates, nulls and business reconciliation.

SQLDataValidation

Learning outcomes

Write useful SELECT queries

Validate joins and aggregates

Detect data-quality problems

Guided lessons

Learn the engineering thinking

Lesson 1

SELECT, WHERE and ORDER BY

Retrieve precise evidence instead of relying only on what the UI displays.

Lesson 2

JOINs

Validate relationships between orders, customers, payments and other linked business entities.

Lesson 3

Aggregations

Use COUNT, SUM and GROUP BY for reconciliation and anomaly detection.

Lesson 4

NULLs and duplicates

Missing and duplicate data often reveal integration and migration problems.

Lesson 5

Data validation patterns

Compare source and target counts, totals, transformations and referential integrity.

Hands-on practice

Do something with what you learned

Do not just tick these mentally. Write the query, create the test matrix, refactor the code, or document the decision. Practical evidence is the point.