Master SQL analytics without collapsing rows.
Develop a precise mental model for OVER, PARTITION BY, ORDER BY, ranking, LAG and LEAD, frames, dialect differences, and performance.
Explain what each part of OVER changes
Choose the correct ranking function when ties matter
Build running, rolling, and period-comparison metrics
Control frames and translate patterns across SQL dialects
A retail dataset used across every module for ranking, customer behavior, inventory, payments, and delivery analysis.
SQL Fundamentals is required. SQL Mastery is recommended.
Open any module to review its exact sections. Progress and completion follow you through the course.
Topics include Why window functions exist, The OVER() clause anatomy, PARTITION BY, slicing the data, and more.
Topics include ROW_NUMBER, unique sequential ranks, RANK, competition ranks with gaps, DENSE_RANK, tiers without gaps, and more.
Topics include SUM/AVG/COUNT/MIN/MAX with OVER, Running totals, Grand totals & percent-of-total, and more.
Topics include LAG, look at the previous row, LEAD, look at the next row, Period-over-period growth, and more.
Topics include Default frames, and why they bite, ROWS, physical row counting, RANGE, logical value counting, and more.
Topics include The SQL standard vs vendor reality, PostgreSQL extensions: FILTER, IGNORE NULLS, RANGE BETWEEN INTERVAL, only in some dialects, and more.
Topics include FIRST_VALUE & LAST_VALUE, and the LAST_VALUE trap, NTH_VALUE, sampling the Nth row, PERCENT_RANK & CUME_DIST, and more.
Topics include Windows vs self-joins, when each wins, Common anti-patterns and how to spot them, EXPLAIN reading for window queries, and more.
Analysts moving into advanced SQL
Analytics engineers
Candidates preparing for senior SQL interviews
These are independent LDS courses that extend the closest skills. Choose the direction that matches what you want to build next.
Turn complex business logic into readable SQL.
Design experiments that survive real scrutiny.
Write useful SQL from your first lesson.
The first module establishes the language and example used throughout the rest of the course.
