Free Udemy Course 2025: Certified SQL & Databases for Data Science

Course Overview: Certified SQL & Databases for Data Science This comprehensive course is meticulously designed to transform beginners and intermediate analysts into certified SQL experts ready to tackle real-world data science challenges. Unlike standard SQL courses, we focus exclusively on the specific query optimization, performance tuning, and advanced analytical techniques demanded by modern data science pipelines. We start with a robust foundation in relational database theory, primary keys, foreign keys, and normalization. We then rapidly escalate to mastering complex joins, subqueries, and table manipulation (CRUD operations). Mastering Analytical SQL The core of this course lies in analytical SQL. You will learn how to leverage powerful tools like Common Table Expressions (CTEs), advanced grouping using ROLLUP and CUBE, and the essential **Window Functions** (e.g., RANK, LAG, LEAD, moving averages) to perform sophisticated data aggregation and time series analysis directly within the database. Database Management and Python Integration A certified data scientist must understand how to interact with live production databases. We cover essential database concepts (indexing, views, stored procedures) that maximize query efficiency. Crucially, you will learn how to seamlessly connect SQL results into Python environments using libraries like Psycopg2/SQLAlchemy and Pandas, ensuring smooth ETL processes and rapid model development. What Makes This Course Unique? This isn't just a syntax tutorial; it's a certification preparation course focused on performance and application. We use large, realistic datasets and provide practical case studies focused on typical data science problems (A/B testing analysis, funnel optimization, cohort segmentation), ensuring you gain immediately applicable skills. Upon completion, you will possess a strong, certifiable skill set in high-performance data retrieval and manipulation.