Striver SQL LeetCode Problems

A well-structured repository to track SQL problem solving, solution organization, and direct mapping between curated problem names and official LeetCode problem links. This repository is designed for systematic SQL interview preparation with clean folder structure, readable solutions, and easy navigation.

Repository Purpose

This repository helps organize SQL practice in a portfolio-friendly format by connecting each curated problem label to its official LeetCode page and linking each listed problem name to a local solution file inside the repository.

SQL Problem Map

Click the Problem Name to open the local SQL solution file in the repository.
Click the LeetCode Link to open the official problem statement.

Sr. No.	Problem Name	LeetCode Link
1	Large Nations	Big Countries
2	Profitable Customers in 2021	Find Customers With Positive Revenue This Year
3	Odd Non-Boring Movies	Not Boring Movies
4	Filter Records Excluding a Specific Pattern	Link to be added
5	Find Records Excluding a Given Set of Values	Link to be added
6	Find Salaries Outside the Expected Range	Link to be added
7	Non-Referred Customers	Find Customer Referee
8	First Login Analysis	Game Play Analysis I
9	Employee Work Time Summary	Find Total Time Spent by Each Employee
10	Unique Subjects per Teacher	Number of Unique Subjects Taught by Each Teacher
11	User Follower Count	Find Followers Count
12	CRM Automotive Sales Analysis	Daily Leads and Partners
13	Highest Order Placing Customer	Customer Placing the Largest Number of Orders
14	Frequent Actor-Director Duos	Actors and Directors Who Cooperated At Least Three Times
15	Large Classes	Classes With at Least 5 Students
16	Email Duplicates	Duplicate Emails
17	Call Count Between Pairs	Number of Calls Between Two Persons
18	Valid Triangle Check	Triangle Judgement
19	Instant Food Delivery	Immediate Food Delivery I
20	Special Bonus Calculation	Calculate Special Bonus
21	Node Classification	Tree Node
22	Apples vs Oranges	Apples & Oranges
23	Query Quality Analysis	Queries Quality and Percentage
24	Exceeding Tweet Length	Invalid Tweets
25	System Settings	Link to be added
26	Employee Salary	Swap Salary
27	Combine Active and Archived Users	Active Users
28	Merge Recent Orders from Multiple Sources	Link to be added
29	Combine Sales Records Without Deduplication	Link to be added
30	Reshape Products Data	Rearrange Products Table
31	Employees and Their Departments	Link to be added
32	Customer Orders Overview	Link to be added
33	Employees With Confirmed Salary Records	Link to be added
34	Generate All Possible User-Category Pairs	Link to be added
35	Employees With or Without Salary Records	Link to be added
36	Match Employees With Their Salaries	Link to be added
37	Employees Earning More Than Their Manager	Employees Earning More Than Their Managers
38	Students Enrolled in Courses	Students with Invalid Departments
39	Sales Analysis	Product Sales Analysis I
40	Minimum Distance Between Points	Shortest Distance in a Line
41	Suspended Accounts	Leetflex Banned Accounts
42	Find Team Size for Each Employee	Find the Team Size
43	Average Experience by Project	Project Employees I
44	Warehouse Stock Manager	Warehouse Manager
45	Table Join Operation	Link to be added
46	Inactive Customers	Active Users
47	Students Enrolled in Non-Existent Departments	Link to be added
48	Low Bonus Employees	Employee Bonus
49	Available Seat Streaks	Available Seats
50	Visitors Without Transactions	Customer Who Visited but Did Not Make Any Transactions
51	A & B Buyers Without C	Link to be added
52	Product Selling Price Report	Average Selling Price
53	Updated Bank Balances	Bank Account Summary II
54	Most Frequent Travellers	Top Travellers
55	Suggested Pages	Page Recommendation II
56	Contest Participation Rate	Percentage of Users Attended a Contest
57	High-Report Managers	Managers with at Least 5 Direct Reports
58	All-Product Buyers	Customers Who Bought All Products
59	Highest Non-Repeating Number	Biggest Single Number
60	Find the First Device Logged In by Each Player	Game Play Analysis I
61	Salespersons Without RED Orders	Sales Person
62	Employees with the Highest Salary in Each Department	Department Highest Salary
63	Find the Most Recent Order for Each Product	The Most Recent Orders For Each Product
64	Find Transactions with Maximum Amount Per Day	Maximum Transaction Each Day
65	Incomplete Employee Records	Employees With Missing Information
66	Find Quiet Students in All Exams	Find The Quiet Students In All Exams
67	Top Grade per Student	Highest Grade For Each Student
68	Swap Consecutive Seats	Exchange Seats
69	Safe Investment Countries	Countries You Can Safely Invest In
70	Tennis Grand Slam Winners	Grand Slam Titles
71	Football Team Scores	Team Scores In Football Tournament
72	Order Count per Customer	Customer Order Frequency
73	Boolean Expression Evaluator	Evaluate Boolean Expression
74	Immediate First Orders Percentage	Immediate Food Delivery II
75	Find All Employees Reporting to the Head of the Company	All People Report To The Given Manager
76	Orphan Employees	Employees Whose Manager Left the Company
77	Most Frequently Ordered Product(s) for Each Customer	Most Frequently Ordered Product for Each Customer
78	Find Missing Subtasks for Each Task	Find the Subtasks That Did Not Execute
79	Latest 2020 Login	The Latest Login in 2020
80	Kid-Friendly Movies in Last Month	Link to be added
81	Warmer Days	Rising Temperature
82	Restaurant Payment Trends	Restaurant Growth
83	Inactive Sellers	Sellers With No Sales