Independent Company Challenges
Apple-style SQL challenges
Independent Apple-style product, retail, services, support, workforce, and device-usage SQL practice.
These independent exercises use Apple-relevant business domains; they are not claimed to be questions used by Apple, and this site is not affiliated with the company.
- Exercises
- 20
- Difficulty
- Beginner to Hard
What this collection tests
Skills and query patterns
Product analytics, retail locations, subscriptions, customer support, workforce, apps, and devices
Curated exercises
Choose a challenge
Work in the live editor where supported. Advanced guided labs state their engine boundary before you open the workspace.
- Challenge 1Beginner
iPhone Product Catalog
Which iPhone models are currently for sale, and what are their storage, colour, and price options?
- Filtering
- Sorting
SQLite live
Open challenge → - Challenge 2Beginner
Active Apple Music Subscribers
Which customers currently hold an active Apple Music subscription, and what plan are they on?
- Joins
- Filtering
- Sorting
SQLite live
Open challenge → - Challenge 3Beginner
Flagship Store Locations
Which Apple stores are Flagship locations, and how many employees work at each?
- Filtering
- Sorting
SQLite live
Open challenge → - Challenge 4Beginner
Orders Using Apple Pay
Which orders were paid using Apple Pay, and who made them?
- Joins
- Date analysis
- Filtering
SQLite live
Open challenge → - Challenge 5Easy
Top Rated Apps
Which apps on the App Store have the highest ratings, and how many downloads have they reached?
- Filtering
- Sorting
- Top-N
SQLite live
Open challenge → - Challenge 6Easy
Genius Bar Appointments Today
Which Genius Bar appointments are scheduled for January 11, 2024 — who are the customers, which stores, and what are their issues?
- Joins
- Filtering
- Sorting
SQLite live
Open challenge → - Challenge 7Medium
Product Category Revenue Analysis
For each product category, what is the total revenue, number of orders, and average order value? Only show categories generating at least $200 in revenue.
- Joins
- Subqueries
- Aggregation
SQLite live
Open challenge → - Challenge 8Medium
Customer Purchase Frequency Analysis
For each customer who has placed at least one order, show their total orders, total spent, average order value, and rank them by total spend.
- Window functions
- Joins
- Aggregation
SQLite live
Open challenge → - Challenge 9Medium
App Category Performance Analysis
For each App Store category with at least 5 million total downloads, show total downloads, average rating, app count, and rank by download volume.
- Window functions
- Aggregation
- HAVING
SQLite live
Open challenge → - Challenge 10Medium
Store Performance Comparison
For each retail order location with at least one delivered order, show total revenue, average transaction value, order count, and its rank among retail locations.
- Window functions
- Joins
- Aggregation
SQLite live
Open challenge → - Challenge 11Beginner
Discontinued Products
Which Apple products have been discontinued and are no longer for sale?
- Filtering
- Sorting
SQLite live
Open challenge → - Challenge 12Easy
Open Support Tickets
Which support tickets are still open or in progress — who are the customers, what products, and how urgent?
- Joins
- CASE expressions
- Date analysis
SQLite live
Open challenge → - Challenge 13Easy
iCloud Storage Plan Segments
How many customers fall into each iCloud storage tier, and what is the average storage in each group?
- Aggregation
- CASE expressions
- Numeric functions
SQLite live
Open challenge → - Challenge 14Easy
Average Screen Time by Device
What is the average daily screen time and app opens for each Apple device type?
- Aggregation
- Numeric functions
- Sorting
SQLite live
Open challenge → - Challenge 15Medium
Department Budget vs Salary Cost
For each department, how does the total salary cost compare to the budget, and what is the average salary?
- Joins
- Aggregation
- Numeric functions
SQLite live
Open challenge → - Challenge 16Medium
App Store Download Revenue by Category
For each app category downloaded by our customers, how many were free vs paid, and what is the total revenue generated?
- Aggregation
- CASE expressions
- Numeric functions
SQLite live
Open challenge → - Challenge 17Hard
Employees Earning Above Department Average
Which employees earn more than their department average salary, and by how much?
- CTEs
- Joins
- Subqueries
SQLite live
Open challenge → - Challenge 18Hard
Genius Bar Appointment Summary by Store
For each Apple store, how many Genius Bar appointments have been held in total, and how many were completed vs scheduled?
- Joins
- Aggregation
- CASE expressions
SQLite live
Open challenge → - Challenge 19Hard
Top-Spending Customer per Country
In each country, which customer has spent the most on Apple products, and how much have they spent?
- CTEs
- Window functions
- Joins
SQLite live
Open challenge → - Challenge 20Hard
Apple Music Cancellation Rate by Plan
For each Apple Music plan type, what is the total number of subscribers, how many have cancelled, and what is the cancellation rate?
- Aggregation
- CASE expressions
- Numeric functions
SQLite live
Open challenge →
Attempt
Write a query or design from the brief before opening any hints.
Validate
Run it against the included dataset and inspect the output.
Explain
Compare the verified answer and explain each choice aloud.
Learn before practicing Apple
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