SQL Querying: Fundamentals — Lesson 3: Grouping, Summaries, Set Operators, and Table Joins

Topics Covered

• Group and summarize data with aggregate functions, GROUP BY, and HAVING
• Combine compatible result sets with UNION, INTERSECT, and EXCEPT
• Join tables using keys and appropriate inner or outer join logic
• Security, reliability, performance, support, and operational controls
• Common failure patterns, diagnostic evidence, and root-cause analysis
• Corrective actions, rollback considerations, and reusable runbook updates

Guided Practice Steps

1. Translate the lesson requirement into a clear SQL Querying: Fundamentals implementation or analysis objective.
2. Document assumptions, selected tools or features, dependencies, risks, and expected results.
3. Perform the guided task, capture evidence, and compare the result with the acceptance criteria.
4. Record issues, corrective actions, and a reusable operational or development note.

Practical Activity

Produce grouped results and combine data with a join and a set operator.

• Define the scenario, inputs, constraints, and expected outcome.
• Complete the activity and preserve screenshots, outputs, logs, code, or decision evidence.
• Review the result, identify gaps, and document corrective or improvement actions.

Validation Checklist

• The stated requirement and expected outcome are clear.
• Configuration, code, data, or design decisions are documented.
• Normal, boundary, failure, security, and operational considerations are reviewed.
• Evidence supports the conclusion and the next action is prioritized.

Lesson Outcome

Learners can explain and apply Grouping, Summaries, Set Operators, and Table Joins within a realistic SQL Querying: Fundamentals scenario and support the result with validation evidence.