Welcome to LearnOracleSQL.com

Welcome to your first step into the world of Oracle SQL. This is where i like to introduce you to Oracle topics in the simplest way possible. In my experience, this is the perfect path to start learning Oracle SQL.

In this Page, I will walk you through everything you need to know about Oracle Basics, Whether you are brand new to databases or brushing up after a break, this guide is designed to build your confidence and help you to understand how Oacle works, one topic at a time.

Hey Geeks!

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🚀 Pick Your Learning Path

I’ve organized everything here into logical paths—you can jump around, follow the flow, or just learn what you need. It all fits together, but there’s no strict order. Just read, practice, and repeat.

📘 Oracle SQL — Basics to Pro

  • Fetching Data: SELECT, FROM, column_name – Learn to fetch all or only the columns you care about.
  • Filtering Data: WHERE, BETWEEN, IN, LIKE, IS NULL – Pin down exactly what you need from big tables.
  • Sorting Results: ORDER BY, ASC, DESC, ROWNUM – Arrange output by date, name, or top salary.
  • Aggregations: COUNT, SUM, AVG, MIN, MAX – Get totals, averages, highs, and lows in your data.
  • Grouping Data: GROUP BY, HAVING – Group info like total sales per region.
  • Combine Conditions: AND, OR, NOT, =, !=, <, > – Write smart filters with multiple criteria.
  • Joins: INNER, LEFT, RIGHT, FULL – Bring in data from multiple tables in meaningful ways.
  • Subqueries: Nested SELECTs, EXISTS – Use results from one query in another to filter results.
  • Case Logic & Expressions: CASE, DECODE, NVL, COALESCE – Write conditions to format values on the fly.
  • Analytical Queries: ROW_NUMBER, RANK, DENSE_RANK, LAG, LEAD – Build powerful reports with ranking and comparisons.
  • Set Operations: UNION, UNION ALL, INTERSECT, MINUS – Combine, compare, or filter sets of results.
  • Built-In Functions: SYSDATE, TO_CHAR, LENGTH, ROUND, UPPER – Format and convert data types easily.
  • Readability & Best Practices: Using aliases, avoiding SELECT *, commenting code — so your queries stay clean and shareable.

📗 Oracle PL/SQL — Project‑Level Skills

  • PL/SQL Blocks: DECLARE, BEGIN, EXCEPTION, END — Understand program structure.
  • Variables: Using VARCHAR2, NUMBER, BOOLEAN, %TYPE, %ROWTYPE to make code data-aware.
  • Control Structures: IF, CASE, LOOP — Handle decision-making and loops easily.
  • Cursors: Implicit and explicit cursor with FOR loops — process multi-row data safely.
  • Procedures & Functions: Write reusable logic blocks that can be shared across apps.
  • Packages: Group related code and definitions to stay organized.
  • Exception Handling: Catch errors gracefully—avoid runtime crashes.
  • Triggers: Automate tasks when data is inserted, updated, or deleted.
  • Real-World Examples: Salary updates, insert logging, audit routines—you’ll write code like this in real life.

⚡ Oracle SQL Performance Tips

  • ✅ Always filter on indexed columns.
  • ✅ Avoid SELECT * in large tables.
  • ✅ Don’t wrap WHERE columns inside functions—breaks indexes.
  • ✅ Understand join orders and avoid full table scans.
  • ✅ Use EXPLAIN PLAN or Toad/SQL Developer tools to check query cost.
  • ✅ Consider using bind variables to avoid hard parse penalties.
  • ✅ Break long queries into steps and test performance piece by piece.

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🙋 Who’s Writing This?

I’m a working Oracle developer and ERP consultant based in Toronto. I’ve built PL/SQL blocks, reports, dashboards, and fixed a ton of production issues. But I remember how confusing it was when I learned it—so I built this site to simplify everything, one concept at a time.

Outside work, I love road trips (like the icy Alcan Highway), exploring tools, and always trying out something new. I put all that learning into simple, no-nonsense tutorials so you don’t fall into the same learning rabbit hole I did.

Learn more about me →

More tutorials, quizzes, and real-case examples are on the way. If you spot a topic marked “coming soon,” it means I’m working on it right now. Stay tuned!

📘 Fetching Data

Learn how to retrieve data using SELECT, FROM, and understand result sets.

Learn More →

📙 Filtering Data

Master WHERE, IN, LIKE, and null-safe filtering.

Learn More →

📗 Sorting Results

Understand ORDER BY, ASC, DESC, and row ordering tricks.

Learn More →

📒 Grouping & Aggregates

Learn GROUP BY, HAVING, SUM, AVG, etc. with real cases.

Learn More →

📕 Joins

Combine data from multiple tables using INNER, LEFT, RIGHT joins.

Learn More →

📓 Subqueries

Use one query inside another with EXISTS and nested SELECT blocks.

Learn More →

📘 Fetching Data

Learn to retrieve data using SELECT, FROM with real-world examples, and master result sets.

Explore More →

📙 Filtering Data

Master WHERE, BETWEEN, IN, IS NULL to slice and dice your results.

Explore More →

📗 Sorting Results

Use ORDER BY with ASC and DESC to control how your output appears.

Explore More →

🚀 Oracle SQL Learning Paths (Beginner to Advanced)

Follow this hands-on learning path to master Oracle SQL with real-world use cases. Whether you’re a beginner or brushing up, each link takes you to an easy guide with examples and use cases.

🙋 About the Author

I’m a real Oracle developer based in Toronto, sharing what I learned the hard way. I built this site to make Oracle SQL & PL/SQL easier for anyone. Whether you’re a fresher or already working in IT, this place is for you.

Read my story →

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⚡ Tutorials are being updated weekly. Stay tuned for more real-life examples, quizzes, and code practice posts.