Want to unlock the power of data? SQL is a fundamental skill for anyone working with databases, from analysts and marketers to developers and project managers. But where do you start?
I've compiled a list of some of the best FREE courses to kickstart your SQL journey, along with a structured roadmap to guide your learning week by week.
- Khan Academy - Intro to SQL: A great starting point for absolute beginners, covering the basics of SQL queries.
- Codecademy - Learn SQL: Interactive lessons that help you practice writing SQL code in real-time.
- Coursera (Audit Option) - Databases and SQL for Data Science (IBM): A more in-depth course focused on using SQL for data analysis. Look for the "Audit" option to access the content for free.
- Udemy (Search for free SQL courses): Udemy often has a variety of free SQL courses covering different aspects and levels.
- SQLZoo: A website dedicated to interactive SQL exercises and tutorials.
SQL Learning Roadmap (Weekly Breakdown):
- Week 1: Fundamentals of SQL: Introduction to databases and SQL. Basic SELECT statements, filtering data with WHERE. Sorting results with ORDER BY. Understanding data types.
- Week 2: Filtering and Sorting: Advanced WHERE clauses (AND, OR, NOT). Using LIKE for pattern matching. Working with NULL values. Sorting by multiple columns.
- Week 3: Aggregating Data: Introduction to aggregate functions (COUNT, SUM, AVG, MIN, MAX). Grouping data with GROUP BY. Filtering groups with HAVING.
- Week 4: Joining Tables: Understanding different types of joins (INNER, LEFT, RIGHT, FULL). Combining data from multiple tables.
- Week 5: Subqueries: Writing queries within queries. Using subqueries in WHERE and SELECT clauses.
- Week 6: Modifying Data: INSERT, UPDATE, and DELETE statements. Understanding data integrity and constraints.
- Week 7-8: Practice and Projects: Work on personal projects or find online datasets to practice your skills. Consider exploring more advanced topics like window functions or stored procedures.
Remember, consistency is key! Dedicate regular time to learning and practice. Don't be afraid to experiment and make mistakes – that's how you learn!
What are your favorite SQL learning resources? Share them in the comments below! 👇
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