SQL IQ – Advanced SQL Interview Queries Search and Prep System

Many people feel lost when they start preparing for SQL interviews 😕. They Google queries, watch random YouTube videos, scroll through blog posts, but still don’t get solid, focused practice.

Most of the time, the questions they find are either too basic, too advanced without explanation, or not even relevant to what real companies ask. This makes prep confusing, frustrating, and time-consuming.

So, we created SQL IQ ✅ — a tool to solve this exact problem. It’s designed to give you real SQL interview questions, actually used by top companies like Google, Amazon, Meta, and others 💼 — all in one place, neatly organized, and ready to practice.

---

💡 What does SQL IQ do?

SQL IQ is a searchable, structured SQL interview prep system. It gives you a large and growing collection of real-world SQL queries asked in interviews — but not in a random list.

Instead, the questions are:

• Carefully selected from authentic interview experiences
• Categorized by topic to match what’s commonly tested
• Designed to improve both your syntax knowledge and query logic
• Perfect for learning how to solve problems step-by-step, not just memorizing answers

This approach helps you practice better and learn how to break down SQL questions, write clear solutions, and even optimize queries when needed.

---

🧠 You can explore questions by:

📌 Topic-Based Filters

Instead of jumping around different tutorials, SQL IQ lets you practice exactly what you need by focusing on specific skills. Some key topics:

• SELECT – Learn to extract and filter data using WHERE, GROUP BY, ORDER BY, etc.
• JOINs – Understand how to work with INNER JOIN, LEFT JOIN, RIGHT JOIN, FULL OUTER JOIN
• SUBQUERIES – Practice nested queries using WHERE, IN, EXISTS, etc.
• CTEs (Common Table Expressions) – Break down complex queries using WITH clauses
• WINDOW Functions – Learn RANK(), DENSE_RANK(), ROW_NUMBER(), LAG(), LEAD(), etc.
• Indexing & Optimization – Understand how indexes affect query performance and interview questions around efficiency
• String and Date Functions – Format, manipulate, and extract values from strings and dates with functions like SUBSTRING(), DATE_DIFF(), TO_CHAR(), etc.

This structure helps you build mastery one topic at a time — which is the best way to gain confidence.

---

🏢 Company-Based Filters

You can also filter questions by companies like:

• Google
• Amazon
• Meta (Facebook)
• Netflix
• Uber
• Microsoft
• Salesforce ...and more.

Each company tends to test certain patterns. For example:

• Meta often asks about data transformation and ranking problems using CTEs and WINDOW functions.
• Amazon may focus more on query optimization, working with large datasets, or JOIN-heavy queries.
• Google tests analytical thinking — combining multiple SQL concepts together in a single question.

This allows you to practice company-specific styles and prep with precision.

---

🛠️ Some Ready-to-Practice Examples:

To give you an idea of what you’ll actually work on inside SQL IQ:

• 🔸 Find the second highest salary from the Employee table using different methods (subquery, CTE, RANK())
• 🔸 Get each user’s first purchase using ROW_NUMBER() over partition
• 🔸 Identify products that never sold using LEFT JOIN and IS NULL logic
• 🔸 Calculate running totals for monthly revenue using SUM() OVER()
• 🔸 Find top 3 customers by revenue per region using dense_rank() in a CTE
• 🔸 Filter orders placed in the last 30 days using DATE_DIFF() or NOW()

Every question comes with clarity in structure and focuses on real reasoning, not just writing one-liners.

---

🖥️ What makes SQL IQ special?

SQL IQ was made to fix what most other platforms get wrong. Here's why it's different:

✅ Super User-Friendly: Clean UI, simple layout, no distractions. Everything is just one or two clicks away.
✅ Fast, Lightweight, and No Signup Needed: No accounts, no ads, no paywalls. Just pure learning.
✅ Designed for Every Level: Whether you’re a student starting out, a software dev brushing up on SQL, or an experienced data engineer preparing for a senior role — it scales to your level.
✅ No Boring Textbook Questions: Every query is based on real-world datasets and interview scenarios.
✅ Structured Practice, Not Guesswork: You’ll learn not just how to write SQL, but how to think through SQL problems like an interviewer expects.

---

🚀 Why we built it:

SQL is one of the most important skills for roles like:

• 📊 Data Analyst
• 🧠 Data Scientist
• 🧱 Data Engineer
• 📈 Business Intelligence Developer
• 🔧 Backend Developer
• 📦 Product Analyst
• 🧪 QA/Automation roles with data validation

But most online resources are scattered, outdated, full of ads, or too basic. Even paid courses don’t give you real questions asked in real interviews.

So we made SQL IQ to be:

• 🔹 Easy to access
• 🔹 Realistic in question quality
• 🔹 Focused on interview preparation, not just learning theory

Our mission is simple: Help people practice smarter and land better jobs 💼

---

👥 Who should use SQL IQ?

• 🎓 Students preparing for internships and new grad roles
• 👨‍💻 Developers moving into data or backend roles
• 🧑‍💼 Professionals aiming for roles at top tech companies
• 🔄 Career switchers moving from non-technical fields to data
• 📈 Anyone who wants to build confidence with SQL for interviews

Even if you know basic SQL, this tool helps you go from "I can write queries" to "I can solve real problems under pressure."

---

🏁 Final Note:

With SQL IQ, you don’t just “learn SQL” — you actually train yourself to solve interview questions with clarity, logic, and speed. You improve your technical thinking and reduce your interview stress.

No more guesswork. No more random prep.
Just real SQL. Real questions. Real results.

---

🌐 Try it now — it’s free and live:
👉 https://techbeamers.com/sql-interview-prep/

Launching soon on Product Hunt 🚀 and featured on Awesome Indie 🎉
Would love your feedback ❤️