Oracle Database 19c: SQL Workshop — Lesson 2: Joins, Aggregation, Grouping, and Reconciliation

Technical Scope

• inner, outer, cross, self, and non-equi joins
• aggregate functions and GROUP BY
• HAVING and advanced grouping awareness
• join cardinality and total reconciliation

Instructor Demonstration

Demonstrate inner, outer, cross, self, and non-equi joins inside a sales-and-staffing schema where every query must include an expected result, row-count check, and edge case, then capture the exact configuration, command, transaction, report, or code evidence that proves the result.

Applied Workshop

Implement a controlled workshop covering aggregate functions and GROUP BY and HAVING and advanced grouping awareness, then test a failure or exception involving join cardinality and total reconciliation.

1. Confirm environment, identity, data, dependencies, and expected result.
2. Complete the product-specific implementation or analysis.
3. Capture commands, configuration, output, logs, transactions, or reports.
4. Explain the operational, security, performance, or business trade-off.

Validation Standard

The Joins, Aggregation, Grouping, and Reconciliation result must be reproducible, traceable to approved inputs, and consistent with the expected Oracle product behavior.

• The intended target and ownership are verified.
• The result is supported by reproducible evidence.
• Security, performance, reliability, and support impact are reviewed.
• Unexpected behavior is investigated before acceptance.

Failure Analysis

Diagnose issues in inner, outer, cross, self, and non-equi joins, aggregate functions and GROUP BY, HAVING and advanced grouping awareness, or join cardinality and total reconciliation without making an unverified production change.

Learners isolate the smallest proven cause, apply a reversible correction, rerun validation, and record the preventive action.