Databases & SQL Skill

Overview

Master SQL and database concepts essential for data analysts, from basic queries to advanced optimization and data warehousing.

Core Topics

SQL Fundamentals

• SELECT, FROM, WHERE, ORDER BY
• JOINs (INNER, LEFT, RIGHT, FULL)
• GROUP BY and aggregate functions
• Subqueries and CTEs

Advanced SQL

• Window functions (ROW_NUMBER, RANK, LAG, LEAD)
• Recursive queries
• Query optimization and execution plans
• Index strategies