This repository contains a comprehensive collection of SQL queries, covering everything from basic operations to advanced techniques. The queries are organized to provide a structured learning experience, suitable for beginners as well as experienced developers.
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Introduction to SQL
- Basic SQL syntax
- Selecting data
- Filtering data with WHERE clauses
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Working with Multiple Tables
- JOIN operations (INNER, LEFT, RIGHT, FULL)
- Self-joins and subqueries
- Cross joins (Cartesian products)
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Aggregations and Grouping
- COUNT, SUM, AVG, MIN, MAX
- GROUP BY and HAVING clauses
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Advanced SQL Techniques
- Window functions
- Common Table Expressions (CTEs)
- Recursive queries
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Database Management
- Creating and modifying tables
- Indexes and constraints
- Transactions and concurrency control
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Practical Examples and Exercises
- Real-world scenarios
- Query optimization tips
- Practice exercises
- Learning: Follow the course content in the provided order to build your SQL skills step-by-step.
- Reference: Use individual queries as examples or templates for your projects.
- Practice: Try out the provided exercises and compare your results with the solutions.
- A working SQL environment (e.g., MySQL, PostgreSQL, SQL Server).
- Access to sample databases like Northwind, Pubs, or any other relevant databases.
Contributions are welcome! If you have additional queries or improvements, please submit a pull request.