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Features
Mock Interview
Dashboard
Jobs
Pricing
Resources
Help
PhantomCodeAI
Features
Mock Interview
Dashboard
Jobs
Pricing
Resources
Help
Features
Mock Interview
Dashboard
Jobs
Pricing
Resources
Help
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LeetCode Problems
Database
Database
Problems
94 Database LeetCode problems · Solve with AI-powered hints & step-by-step explanations.
175
Combine Two Tables
Easy
176
Second Highest Salary
Medium
177
Nth Highest Salary
Medium
178
Rank Scores
Medium
180
Consecutive Numbers
Medium
181
Employees Earning More Than Their Managers
Easy
182
Duplicate Emails
Easy
183
Customers Who Never Order
Easy
184
Department Highest Salary
Medium
185
Department Top Three Salaries
Hard
196
Delete Duplicate Emails
Easy
197
Rising Temperature
Easy
262
Trips and Users
Hard
511
Game Play Analysis I
Easy
550
Game Play Analysis IV
Medium
570
Managers with at Least 5 Direct Reports
Medium
577
Employee Bonus
Easy
584
Find Customer Referee
Easy
585
Investments in 2016
Medium
586
Customer Placing the Largest Number of Orders
Easy
595
Big Countries
Easy
596
Classes With at Least 5 Students
Easy
601
Human Traffic of Stadium
Hard
602
Friend Requests II: Who Has the Most Friends
Medium
607
Sales Person
Easy
608
Tree Node
Medium
610
Triangle Judgement
Easy
619
Biggest Single Number
Easy
620
Not Boring Movies
Easy
626
Exchange Seats
Medium
627
Swap Salary
Easy
1045
Customers Who Bought All Products
Medium
1050
Actors and Directors Who Cooperated At Least Three Times
Easy
1068
Product Sales Analysis I
Easy
1070
Product Sales Analysis III
Medium
1075
Project Employees I
Easy
1084
Sales Analysis III
Easy
1141
User Activity for the Past 30 Days I
Easy
1148
Article Views I
Easy
1158
Market Analysis I
Medium
1164
Product Price at a Given Date
Medium
1174
Immediate Food Delivery II
Medium
1179
Reformat Department Table
Easy
1193
Monthly Transactions I
Medium
1204
Last Person to Fit in the Bus
Medium
1211
Queries Quality and Percentage
Easy
1251
Average Selling Price
Easy
1280
Students and Examinations
Easy
1321
Restaurant Growth
Medium
1327
List the Products Ordered in a Period
Easy
1341
Movie Rating
Medium
1378
Replace Employee ID With The Unique Identifier
Easy
1393
Capital Gain/Loss
Medium
1407
Top Travellers
Easy
1484
Group Sold Products By The Date
Easy
1517
Find Users With Valid E-Mails
Easy
1527
Patients With a Condition
Easy
1581
Customer Who Visited but Did Not Make Any Transactions
Easy
1587
Bank Account Summary II
Easy
1633
Percentage of Users Attended a Contest
Easy
1661
Average Time of Process per Machine
Easy
1667
Fix Names in a Table
Easy
1683
Invalid Tweets
Easy
1693
Daily Leads and Partners
Easy
1729
Find Followers Count
Easy
1731
The Number of Employees Which Report to Each Employee
Easy
1741
Find Total Time Spent by Each Employee
Easy
1757
Recyclable and Low Fat Products
Easy
1789
Primary Department for Each Employee
Easy
1795
Rearrange Products Table
Easy
1873
Calculate Special Bonus
Easy
1890
The Latest Login in 2020
Easy
1907
Count Salary Categories
Medium
1934
Confirmation Rate
Medium
1965
Employees With Missing Information
Easy
1978
Employees Whose Manager Left the Company
Easy
2356
Number of Unique Subjects Taught by Each Teacher
Easy
3220
Odd and Even Transactions
Medium
3374
First Letter Capitalization II
Hard
3421
Find Students Who Improved
Medium
3436
Find Valid Emails
Easy
3451
Find Invalid IP Addresses
Hard
3465
Find Products with Valid Serial Numbers
Easy
3475
DNA Pattern Recognition
Medium
3482
Analyze Organization Hierarchy
Hard
3497
Analyze Subscription Conversion
Medium
3521
Find Product Recommendation Pairs
Medium
3554
Find Category Recommendation Pairs
Hard
3564
Seasonal Sales Analysis
Medium
3570
Find Books with No Available Copies
Easy
3580
Find Consistently Improving Employees
Medium
3586
Find COVID Recovery Patients
Medium
3601
Find Drivers with Improved Fuel Efficiency
Medium
3611
Find Overbooked Employees
Medium
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