Oracle Database 19c: SQL Workshop — Lesson 1: SELECT, Expressions, Filtering, Sorting, and Oracle Datatypes

Technical Scope

• SELECT lists, aliases, DISTINCT, and expressions
• WHERE predicates and NULL logic
• ORDER BY, row limiting, and variables
• character, number, date, conversion, and conditional functions

Instructor Demonstration

Demonstrate SELECT lists, aliases, DISTINCT, and expressions 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 WHERE predicates and NULL logic and ORDER BY, row limiting, and variables, then test a failure or exception involving character, number, date, conversion, and conditional functions.

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 SELECT, Expressions, Filtering, Sorting, and Oracle Datatypes 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 SELECT lists, aliases, DISTINCT, and expressions, WHERE predicates and NULL logic, ORDER BY, row limiting, and variables, or character, number, date, conversion, and conditional functions without making an unverified production change.

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