20761C: Querying Data with Transact-SQL 2016 — Lesson 3: Aggregation, Subqueries, CTEs, and Window Functions

Learning Objectives

• Use aggregate functions, GROUP BY, HAVING, and grouping logic
• Develop scalar and correlated subqueries, derived tables, and CTEs
• Apply ranking, offset, aggregate, and analytical window functions

Detailed Topics

• Use aggregate functions: Use aggregate functions, GROUP BY, HAVING, and grouping logic
• Develop scalar and correlated subqueries: Develop scalar and correlated subqueries, derived tables, and CTEs
• Apply ranking: Apply ranking, offset, aggregate, and analytical window functions

Guided Demonstration

1. Review the requirement, environment, dependencies, roles, risks, and expected outcome.
2. Demonstrate the relevant configuration, analysis, code, or administration workflow step by step.
3. Capture settings, outputs, logs, screenshots, calculations, or test evidence.
4. Compare the observed result with the stated acceptance criteria.

Hands-On Activity

Build an analytical query set using grouping and window calculations.

• Document assumptions and the planned sequence before making changes.
• Complete the activity and preserve evidence of normal and exception behavior.
• Record issues, corrective actions, and reusable operational or development notes.

Troubleshooting Focus

• Separate symptoms from causes and collect evidence before applying a fix.
• Check configuration, permissions, data, dependencies, capacity, connectivity, and recent changes.
• Validate rollback, recovery, support ownership, and user or business impact.

Validation Checklist

• The requirement and expected outcome are clear.
• The selected configuration, design, query, code, or process is documented.
• Normal, boundary, failure, security, and operational conditions are reviewed.
• The result is supported by evidence and the next improvement is prioritized.

Lesson Outcome

Learners can explain and apply Aggregation, Subqueries, CTEs, and Window Functions in a realistic scenario and validate the result with documented evidence.