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Practice SQL querying, joins, grouping, and analytics with 304 curated problems.
This path provides hands-on SQL practice from fundamentals to more advanced query patterns.
Person Directory Address Join
Employee Runner-Up Salary Lookup
N-th Distinct Salary Lookup
Leaderboard Dense Score Ranking
Repeated Log Value Streaks
Reports Paid More Than Their Managers
Repeated Email Detector
Customers Without Purchase Activity
Top Earners by Department
Department High-Earner Bands
Deduplicated Email Registry
Daily Temperature Increase Detector
Daily Unbanned Trip Cancellation Rate
Player First Login Snapshot
Player First Login Device
Player Cumulative Gameplay
Player Day-After Retention Rate
Company Median Salary Rows
Team Leads with Five Plus Direct Reports
Frequency-Weighted Median Estimator
Election Winner by Vote Count
Employee Low Bonus Audit
Survey Answer Rate Leader
Employee Rolling Payroll Summary
Department Enrollment Totals
Customer Referral Eligibility
Qualified Policy Investment Sum
Most Orders Customer
Large-Country Screening Report
High-Enrollment Classes Report
Connection Invite Acceptance Ratio
Stadium High-Attendance Sequences
Most Connected User by Accepted Requests
Adjacent Free Seat Finder
Sales Reps Without RED Orders
Hierarchy Node Role Classification
Segment Triplet Triangle Feasibility
Nearest Point Pair Distance in 2D
Minimum Coordinate Gap on a Line
Active Profile Follower Connectivity Report
Monthly Department vs Company Salary Benchmark
Continental Student Roster Pivot
Highest Unique Signal Value
Cinema Highlight Feed
Pairwise Seat Swap Ledger
Payroll Gender Code Toggle Report
Customers With Complete Product Coverage
Frequent Actor-Director Collaboration Pairs
Product Yearly Price Report
Product Quantity Rollup by SKU
First-Year Product Sales Snapshot
Project Team Experience Averages
Projects With Maximum Team Size
Project Assignment Seniority Leads
Top Seller Total Revenue Report
Exclusive Flagship Buyer Report
Quarter-Only Product Sales Report
Install Cohort Day-1 Retention Report
Low-Demand Catalog Titles
Daily First-Time Login User Count
Student Best Grade Course Selection
Yesterday Reported Post Reason Summary
Multi-Signal Above-Benchmark Businesses
Daily User Platform Spend Segmentation
Daily Spam Report Clearance Rate
Rolling Thirty-Day Daily Active Users Report
Thirty-Day Active Session Average
Self-Viewed Article Authors Report
Same-Day Multi-Article Viewers
Buyer Yearly Order Volume Report
Seller Second-Item Brand Affinity Audit
As-Of Product Price Snapshot
Immediate Dispatch Preference Percentage
First-Order Immediate Delivery Percentage
Department Monthly Revenue Pivot Report
Monthly Country Transaction Health Summary
Group Stage Points Champions
Last Passenger Within Bus Weight Limit
Monthly Country Approval and Chargeback Reconciliation
Query Relevance Score and Low-Rating Share
League Standings from Match Results
Annual Service Stability Period Report
Unique Comment Count by Post
Product Period Weighted Average Price
Friend-Liked Page Suggestions
Workforce Chain to Company Head
Student-Subject Exam Attendance Matrix
Continuous Log ID Range Boundaries
Country November Climate Banding
Team Headcount by Member
Daily Cumulative Scores by Gender
Rolling Weekly Revenue Trend Report
Ad Campaign Click-Through Rate Ranking
February 2020 Bulk Product Order Report
Visit Transaction Frequency Distribution
Review Leader and February Top Movie
Students Linked to Retired Departments
Mid-Band Activity Participation Report
Invoice Contact Trust Coverage Report
Penultimate User Activity Snapshot
Employee Identity Bridge Report
Annual Product Sales by Calendar Year
Realized Gain/Loss by Stock Symbol
Cross-Sell Candidates: Bought A and B, Not C
Rider Distance Leaderboard
Consistently Mid-Range Exam Performers
Inventory Net Present Value Lookup
Session Duration Bucket Distribution
Variable Expression Truth Evaluation
Daily Fruit Sales Delta Report
Sustained Login Streak Users
Axis-Aligned Rectangle Opposite-Corner Areas
Company Salary Post-Tax Adjustment
Weekly Category Sales Matrix
Daily Distinct Product Rollup
June Kid-Friendly Movie Broadcast Catalog
Investment-Ready Countries by Call Duration
Dual-Month Customer Spend Qualification
Enterprise User Email Policy Filter
Type-1 Diabetes Code Screening in Patient Records
Latest Three Orders Per Customer
Monthly Canonical Product Sales Rollup
Latest Order Day Per Product
Net Credit Balance and Limit Alerts
Monthly High-Value Order and Buyer Counts
Warehouse Storage Volume by Facility
Visitors Without Checkout Activity
Accounts Above Net Balance Threshold
Top Reordered Products by Customer
Inactive Sellers in 2020
Customer ID Gap Detector
Three-School Unique Delegate Triplets
Contest Participation Rate by Event
Monthly Driver Capacity and Completed Trip Totals
Monthly Driver Utilization Percentage
Rolling Quarter Ride Metrics
Average Process Duration by Machine
Canonical User Display Name Formatter
Product Invoice Financial Rollup
Message Length Policy Violations
Daily Brand Lead-Partner Reach Summary
Call Metrics by Contact Pair
Largest Gap Between User Visits
Nested Fruit Container Inventory Totals
Follower Base Size by User
Direct Report Metrics by Manager
Daily Office Minutes by Employee
Concurrent Multi-IP Session Violations
Sustainable Low-Fat Recyclable Product Filter
Task Execution Gap Detector
Store Price Matrix by Product
Major Tournament Title Tally per Player
Employee Home Department Resolution
Product Price Row Expansion by Store
Uninterrupted Playback Sessions
Accelerated Hiring Shortlist from Contest Medal History
Customers With Net-Positive Revenue in 2021
Daily Peak Transaction IDs
League Performance Metrics by Team
Accounts with Consecutive Income Breaches
Calendar Date Long-Format Renderer
Order Peak Over Global Average
Rule-Based Employee Bonus Allocation
Salary Band Team Assignment
Latest 2020 Access Snapshot by User
Social Page Recommendations with Friend Signals
Account Count by Income Tier
Co-Listening Friend Recommendation Pairs
Friend Pairs with High Same-Day Song Overlap
Signup Confirmation Success Rate by User
Rapid Repeat Confirmation Requesters
High-Overlap Friendship Pairs
User Pairs with Peak Shared Followers
Employee Record Completeness Audit
Daily First-Last Call Counterpart Match
Low-Salary Employees with Departed Managers
School Admission Cutoff Score Planner
Experiment Run Count Grid by Platform and Study
Senior-Priority Budget Hiring Plan
Priority Budget Hiring Plan
Subscribed Accounts Without 2021 Streaming Activity
Low Approval Problem Audit
Qualified Interview Candidates by Experience and Round Score
Member Engagement Tier by Visit-Purchase Conversion
Account Running Balance Timeline
Campus Excellence Challenge Winner
Count Customers with Any High-Value Bill
Retain Orders with Customer Priority Rule
Busiest Airport by Total Flight Traffic
Polynomial Equation String Builder
Passenger Boarding Count Per Bus
Passenger Boarding Count Per Bus
Independent Column Order Reconciliation
Player Peak Win Run
Ranking Shift After Point Updates
Post Topic Resolution from Keyword Signals
Discount-Eligible Users in Policy Window
Identify Repeat Buyers Within Seven Days
Discount-Eligible User List in Policy Window
Driver-Passenger Role Crossover Frequency
Dynamic Store Price Pivot Map
Adaptive Product Price Unpivot by Active Store Set
Products With Sustained Annual Order Volume
Task Submission Split: Weekend vs Working Days
Gender Cycle Display Order
Earliest Peak Degree Day Per City
User Product Spend Leaderboard with Tie Support
User Spending Ranked by Basket Value
Double Round-Robin League Fixtures
Department Exam Percentile Ranking
Instructor Distinct Subject Count
Highest-Value Invoice Line Breakdown
Account Manager Revenue Influence Score
Medal Table Ranking with Cascading Tie-Breakers
Order Log Forward Fill for Missing Drink Labels
Employees Below Monthly Required Hours
Customers With Strict Annual Purchase Growth
Metal-Nonmetal Bond Candidate Matrix
Hall Event Overlap Consolidation
Professional Name Tag Formatter
Latest Employee Compensation Snapshot
Artist Presence Frequency on Streaming Chart
Daily Immediate Delivery Share
Bike Fleet Last Usage Timestamp
Active Users by Seven-Day Repeat Purchases
Customer Transaction Momentum Windows
User Network Reach Percentage
Standalone Market Term File Coverage
Customers With Longest Consecutive Transaction Streak
Flight Seat Occupancy and Wait Queue Summary
Flight Booking Confirmation Status
Weighted Election Results from Split Ballots
User Total Ride Distance Report
Engineering vs Marketing Peak Salary Gap
User Consecutive Three-Day Step Average
Six-Minute Interval Order Rollup
Top Sellers by Distinct Cross-Brand Items
Coordinate Reflection Pairs
City Peak Calling Hour Report
Compressed Order Mean Estimator
Third Transaction Spend Spike Detector
Cities Above National Housing Average
Department Leaders in Maximum-Size Teams
Class Score Spread Analyzer
Dual Loan Category Qualification
Country Wine Podium Report
Friday Spend Snapshot by Week
November Friday Spending Rollup
Viewer-to-Streamer Session Conversion
Three-Topping Pizza Bundle Pricing
Data Scientist Core Skill Shortlist
Priority Warehouse Stock Maximization
Triangle Shape Classification by Side Lengths
Binary Hierarchy Node Role Tagging
State Top Fraud Band Claims
Age Cohort Message Action Time Share
Team Workload Outlier Project Assignments
Direct Connections Without Shared Contacts
Commercial Email Domain Census
Users with Repeat Session Type Within 12 Hours
Terrain Rainwater Retention Analysis
February Hashtag Momentum Leaderboard
February Posting Burst Detector
February Hashtag Trend Leaderboard
Friday Membership Weekly Spend Matrix
Top Call Durations by Direction
Server Fleet Full-Day Uptime
Longest Available Seat Segments
Social Feed Compliance Screening
Employee Work Coverage and Peak Load
Fleet Parking Fee and Duration Summary
Day-Two Signup Verification Users
Major Curriculum Perfect-A Scholars
Major Track Honors Student Filter
State City Directory Rollup
Permission Bitmask Consensus Audit
Annual Product Spend Growth Ledger
Daily Transaction Parity Ledger
Customer Purchase Behavior Command Center
Executive Reporting Depth and Compensation Delta
League Table Points and Shared Rank Positions
League Table Position and Tier Banding
Shift Collision Audit
Employee Shift Overlap Intensity Audit
Project Candidate Skill Fit Ranking
Category Discounted Product Pricing
Fuel-Type Top Driver Performance
Seasonal League Table with Multi-Key Tie-Breaks
State City Roster with Initial-Letter Match
Department Runner-Up Salary Members
Library Books Awaiting Ratings
Word-Start Case Normalization with Space Preservation
Segment-Wise Content Case Normalization
Half-by-Half Team Passing Control Index
Team Internal Pass Streak Maxima
Circular Secret Santa Chain Ledger
Catalog Products with Isolated Three-Digit Blocks
Student Subject Improvement Audit
DotCom Email Compliance Audit
Invalid IPv4 Access Log Census
Product Descriptions with Valid Serial Tokens
DNA Sequence Pattern Signal Audit
Trial-to-Paid Engagement Averages
Frequent Co-Purchase Product Pair Recommendations