Technical · Structured skill path
SQL Coding Assessment & Practice
Hands-on SQL query problem solving from SELECT foundations to expert analytical challenges.
20 progressive levels · Beginner → advanced · 200 published questions
Start with the FREE entry level. PRO levels remain gated and unlock in sequence after sign-in.
Level 1
SELECT & Filtering
SQL SELECT & Filtering Coding Assessment
beginner · 10 published questions
Level 2
Sorting & Limiting
SQL Sorting & Limiting Coding Assessment
beginner · 10 published questions
Level 3
Aggregate Functions
SQL Aggregate Functions Coding Assessment
beginner · 10 published questions
Level 4
GROUP BY & HAVING
SQL GROUP BY & HAVING Coding Assessment
beginner · 10 published questions
Level 5
Basic Joins
SQL Basic Joins Coding Assessment
beginner · 10 published questions
Level 6
Multi-Table Joins
SQL Multi-Table Joins Coding Assessment
beginner · 10 published questions
Level 7
Subqueries
SQL Subqueries Coding Assessment
intermediate · 10 published questions
Level 8
CASE & Conditional Logic
SQL CASE & Conditional Logic Coding Assessment
intermediate · 10 published questions
Level 9
String & Date Functions
SQL String & Date Functions Coding Assessment
intermediate · 10 published questions
Level 10
CTEs
SQL CTEs Coding Assessment
intermediate · 10 published questions
Level 11
Window Functions Foundations
SQL Window Functions Foundations Coding Assessment
intermediate · 10 published questions
Level 12
Ranking & Analytics
SQL Ranking & Analytics Coding Assessment
intermediate · 10 published questions
Level 13
Advanced Window Functions
SQL Advanced Window Functions Coding Assessment
intermediate · 10 published questions
Level 14
Set Operations
SQL Set Operations Coding Assessment
intermediate · 10 published questions
Level 15
Data Quality Queries
SQL Data Quality Queries Coding Assessment
advanced · 10 published questions
Level 16
Reporting Queries
SQL Reporting Queries Coding Assessment
advanced · 10 published questions
Level 17
Complex Analytical SQL
SQL Complex Analytical SQL Coding Assessment
advanced · 10 published questions
Level 18
Query Optimization Challenges
SQL Query Optimization Challenges Coding Assessment
advanced · 10 published questions
Level 19
Advanced Interview SQL
SQL Advanced Interview SQL Coding Assessment
advanced · 10 published questions
Level 20
SQL Coding Expert Challenge
SQL SQL Coding Expert Challenge Coding Assessment
advanced · 10 published questions