Master SQL Queries & Query Optimization
Write and evaluate live SQL queries directly in your browser. Practice relational JOINs, aggregations, subqueries, CTEs, and window functions against pre-populated HR, E-Commerce, and Rideshare schemas.
Explore SQL Practice Topics
Beginner SQL
2 TopicsDatabase & SQL Fundamentals
Practice SQL →Master relational database concepts, SQL command pillars (DQL, DDL, DML, DCL), data types, and foundational SQL syntax.
Basic Querying & Filtering
Practice SQL →Master SELECT, WHERE, ORDER BY, LIMIT, DISTINCT, BETWEEN, LIKE, IN, IS NULL, and basic column aliasing.
Intermediate SQL
3 TopicsRelational JOINs
Practice SQL →Combine multi-table datasets using INNER JOIN, LEFT/RIGHT OUTER JOINs, self-joins, and CROSS JOINs.
Aggregations & Group Filtering
Practice SQL →Aggregate datasets using COUNT, SUM, AVG, and filter consolidated data groups using HAVING.
Built-in Functions & CASE WHEN
Practice SQL →Manipulate text, math, and dates with built-in functions, and implement conditional log mappings.
Expert SQL
4 TopicsAdvanced Subqueries
Practice SQL →Leverage scalar, row, correlated and EXISTS nested subqueries to solve complex data comparisons.
CTEs & Set Operators
Practice SQL →Structure temporary query sets with WITH CTEs, and perform operations using UNION, EXCEPT, INTERSECT.
Window Functions
Practice SQL →Perform relative partition operations using ROW_NUMBER, RANK, DENSE_RANK, LAG, and LEAD window frames.
Database Design & Constraints
Practice SQL →Verify normal forms, map key constraints (FK, PK, UNIQUE), and enforce referential check rules.
Scenario-Focused SQL Analytics Playbooks
FAANG Analytics Core
Scenario-focused FAANG SQL Interview playbook covering JOINs, CTEs, and window functions.
Rideshare Logistics
Ride-sharing logistics data metrics, driver payout calculations, and dispatch queries.
Healthcare Auditing
Healthcare audit query patterns, patient appointment timelines, and clinical data metrics.