Identify Repeat Buyers Within Seven Days - Coding problem | OneNoughtOne
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SQL Practice: Queries to Analytics
0/308 completed
SQL foundations
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SQL Overview
5
Data Definition Language (DDL)
5
SQL Data Types
5
Filtering, ordering and expressions
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Joins and relational queries
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Aggregation and business metrics
0/84
Text and data quality
0/42
Dates, intervals and time series
0/42
Windows, ranking and sequences
0/89
Latest Employee Compensation Snapshot
Minimum Coordinate Gap on a Line
Rapid Repeat Confirmation Requesters
State City Directory Rollup
Team Headcount by Member
Top Seller Total Revenue Report
Accelerated Hiring Shortlist from Contest Medal History
Account Running Balance Timeline
Accounts with Consecutive Income Breaches
Active Users by Seven-Day Repeat Purchases
As-Of Product Price Snapshot
City Peak Calling Hour Report
Continuous Log ID Range Boundaries
Customer Purchase Behavior Command Center
Daily Cumulative Scores by Gender
Daily Peak Transaction IDs
Department Exam Percentile Ranking
Department Leaders in Maximum-Size Teams
Department Runner-Up Salary Members
Earliest Peak Degree Day Per City
Employee Runner-Up Salary Lookup
February Hashtag Momentum Leaderboard
First-Year Product Sales Snapshot
Fleet Parking Fee and Duration Summary
Fuel-Type Top Driver Performance
Gender Cycle Display Order
Identify Repeat Buyers Within Seven Days
Independent Column Order Reconciliation
Largest Gap Between User Visits
Last Passenger Within Bus Weight Limit
Latest Order Day Per Product
Latest Three Orders Per Customer
Leaderboard Dense Score Ranking
League Standings from Match Results
League Table Points and Shared Rank Positions
Longest Available Seat Segments
Low-Demand Catalog Titles
Mid-Band Activity Participation Report
Multi-Signal Above-Benchmark Businesses
N-th Distinct Salary Lookup
Passenger Boarding Count Per Bus
Penultimate User Activity Snapshot
Player Cumulative Gameplay
Qualified Policy Investment Sum
Ranking Shift After Point Updates
Repeated Log Value Streaks
Rolling Weekly Revenue Trend Report
Salary Band Team Assignment
Seasonal League Table with Multi-Key Tie-Breaks
Server Fleet Full-Day Uptime
State Top Fraud Band Claims
Student Best Grade Course Selection
Student Subject Improvement Audit
Survey Answer Rate Leader
Sustained Login Streak Users
Third Transaction Spend Spike Detector
Top Call Durations by Direction
Top Reordered Products by Customer
User Consecutive Three-Day Step Average
User Product Spend Leaderboard with Tie Support
Weighted Election Results from Split Ballots
Annual Service Stability Period Report
Company Median Salary Rows
Consistently Mid-Range Exam Performers
Continental Student Roster Pivot
Country Wine Podium Report
Customer Transaction Momentum Windows
Customers With Longest Consecutive Transaction Streak
Daily First-Last Call Counterpart Match
Department High-Earner Bands
Employee Shift Overlap Intensity Audit
Employee Work Coverage and Peak Load
Flight Booking Confirmation Status
Frequency-Weighted Median Estimator
Group Stage Points Champions
Hall Event Overlap Consolidation
League Table Position and Tier Banding
Major Track Honors Student Filter
Player Peak Win Run
Priority Budget Hiring Plan
Project Candidate Skill Fit Ranking
Rolling Quarter Ride Metrics
Seller Second-Item Brand Affinity Audit
Senior-Priority Budget Hiring Plan
Stadium High-Attendance Sequences
Team Internal Pass Streak Maxima
Terrain Rainwater Retention Analysis
Users with Repeat Session Type Within 12 Hours
Viewer-to-Streamer Session Conversion
Recursive and graph queries
0/15
Apply it: reliable analytical exports
0/2
Course overview & roadmap
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