SQL

Average Driver Rating per City

Average Employee Experience per Project

Average Items per Order

Average Power Consumption

Average Transaction Amount

Calculate Average Product Cost

Calculate Contest Participation Rates

Commute Time Analysis

Customer Placed the Largest Number of Orders

Daily Log Volume

Department-wise Employee Count

Final Account Balance

iCloud Storage Analysis Query

Immediate Food Delivery I

Inventory Multi-Column Grouping

Managers with at Least 5 Direct Reports

Merchant Performance Analysis

Monthly Revenue & Customer Aggregation

New Signups by Country

Protocol Traffic Analysis

QuickBooks vs. TurboTax Filing Count

Select Non-Boring Films

Users With Multiple Tags

Account Balance After Transfers

Active User Query

Aggregation over Dataset Metadata

Average Completion Time

Average Employee Leave

Average Product Ratings per Month

Average Stream Duration Per User by Topic

Average Ticket Resolve Time

Average Time of Process per Machine

Blocked IPs - Top 10 Source IPs

Bridge Checkpoint Analysis

Calculate Call Duration

Connection Statistics

Customer Order Analysis

Customer Order Filtering

Data Ingestion Trends

Driver Rating Analysis

Duplicate File Upload Detection

First and Last Activity

Frequent Transactors

Game Play Analysis III

Identify High Spenders

IoT Traffic Monitoring

Merge Request Activity Summary

Monthly Active Users

Monthly Average Sales Analysis

Monthly Issuance Difference

Monthly Revenue per Merchant

Monthly Traffic Usage Analysis per Customer

Monthly Transaction Analysis

Monthly Usage Summary

New Product Launches

Order Processing Efficiency

Peak Hour Earnings Query

Peak Sales Hour

Power User Identification

Primary vs. Other Address

Recent Order Aggregation

Sending vs. Opening Snaps

Subreddit Activity Reporting

Task Completion Analytics

Team Scores in Football Tournament

Ticket Resolution Latency

Top Contributors by Write Actions

Top Engaged Users by Interaction

Top N Transactions

Top Storage Consuming Users

Top Subreddits by Activity

Trade Volume Aggregation

Unified System View

User Activity for the Past 30 Days I

User Engagement Metrics

User Spend Analysis

Vehicle Bridge-Crossing Tracker

Customer Transaction Analysis

Double-Entry Ledger

Email Click-Through-Rate (CTR)

Friend Requests II: Who Has the Most Friends

Immediate Food Delivery II

Ledger Reconciliation

Calculate Average Processing Duration per Machine

Cartesian Product Analysis

Daily Temperature Increase

Employee Bonus

Employees Earning More Than Managers

Map Employee Codes to Unique Identifiers

Product and Supplier Join

Product Purchase Analysis

Rising Temperature

Unreviewed Products

Visits Without Purchases

Active Customers with Order Count

Average Deal Size by Segment

Average Storage Usage per User

Client Session Duration Report

Combine Two Tables

Complex Joins for Incident Reporting

Department Highest Salary

Employee Department Join

File System Metadata Query

Multi-Table Join HR Report

Orders with Product Details

Promotional Campaign Analysis

Real-Time Dasher Tracking & GPS History

Ride-Sharing Trip Summary

Total Sales Per Region by Product Category

Trip and Payment Schema Linking

Vehicle Service Center Management

Distinct Payment Methods Query

Find Orders with High Totals

First and Last Records

GeoStats

High Protein and Low Carb Foods

Incident Status Filter

Low Quality Problems

Member Referral

Names Starting With Letter and Minimum Length

Overdue Rentals

Post Views

Swap Salary

Threat Detection Log Filter

Unfinished Parts

Count Active Projects

Distinct Flight Routes

Reformat Department Table

Count Unique Courses Taught by Each Instructor

Count User Followers

Daily User Engagement Over 30 Days

Group Transactions by Item

Artist Popularity Rank

Average Login Interval

Average Transaction Rank

Capital Gain/Loss

Daily Final Transaction

First Touch Attribution

Identify Power Users

Merchant Revenue Analysis

Monthly Growth Report

Nth Transaction of Every User

Oscar Nominee Leaderboard

Rank Scores

Remove Duplicates without DISTINCT

Running Total of Cyber Threats per Client

Running Total of Sales

Sales Leaderboard

Sales Volume Growth

Top 3 Categories by Total Revenue

Top K Customers by Spend

Top Merchants by Spend

Top N Categories

Top Rated Products

Top Repository Contributors

User Session Activity

Employees with Departed Managers

Find Missing Product IDs

Cohort Retention

Find Duplicate Records

First 50% of Records

Identify Most Purchased Products

Job Posting Analytics

Latest Transaction per User

Latest Version by Timestamp

Photoshop Revenue Analysis

Restaurant Growth

Slow Shipping Duration Identification

Soft Delete Query on Insert-Only Table

Stock Price Extremes

Complete Album Listeners

Data Inconsistency and Missing Values Backfill

Determine Valid Triangles

Manager Reporting Structure

Course and Student Management System

Deduplicate Activity Logs

Delete Duplicate Emails

Duplicate Detection

Employee Management Chain

Employee-Manager Hierarchy

Find Discrepancies (Reconciliation)

Find Overlapping Bookings

Finding Distinct Communicators

First Share & Closest Collaborator

Historical Address Tracking

Inventory Deductions

Least Efficient Driver

Local Stock Maxima

Managers Earning Less Than Subordinates

Many-to-Many Labeling System

Moving Average of Daily Active Users

Moving Average of Transaction Volumes

Optimistic Locking Implementation

Overlapping Subscriptions

Parking Garage System

Permission System Access Report

Premium Users Exceeding Usage Limit

Product Review System

Project Budget Analysis

Project-Specific Numbering (ID vs. IID)

Real-Time Chat Message Retrieval

Repeated Payment Detection

Restaurant Growth

Revoked Postings

SQL Join with Duplicate Values

Stock Volume Variation Trend

Subscription Service Pro-Rated Billing

Threaded Replies

Top Friends

Transaction Reconciliation

Unique Transfer Relationships

Consecutive Numbers

Consecutive Trading Days

Dating App Mutual Matches

Delivery Latency Query

Design Product Catalog

E-Commerce Database Schema Design

End-to-End Dasher Payouts

Find Cumulative Salary of an Employee

Find Gaps in Sequential IDs

Friend Recommendation Query

Game Play Analysis V

Identify High-Velocity Cards

Median Employee Salary

Merchant Settlement Balance

NFT Minter with Metadata Schema

Notification Delivery Summary

Optimize a Slow Search Query

Overlapping and Disjoint Meetings

Overlapping Time Slots

Pessimistic Locking - Account Transfer

Real-Time Satellite Image Metadata Store

Report Contiguous Dates

Retention Cohorts

Running Sales Since Restock

Slow Merchant Transactions Query

Splitwise Expense Tracker

Temporary Email Service with TTL

Time-Series Ledger - Latest Crypto Price

Top Categories and Active Users

Transaction Management System

Trips and Users

User Activity Report

User Concurrent Sessions

User Engagement Query

Identify Patients with Type I Diabetes

Standardize User Names

JSON Data Extraction