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DevEval
Library
Practice
Problems
Joins
Topic
Joins problems
18 problems: 10 Easy, 8 Medium.
Easy (10)
Rising Temperature
Employees and Bonus
Product Sales Analysis
Top Travellers
Sales Person
Combine Two Tables
Employees Earning More Than Managers
Library Title Search Ranking
Ready Tasks With Satisfied Prerequisites
Open Unmuted Alerts per Service
Medium (8)
Consecutive Numbers
Managers With 5+ Reports
Winning Candidate
Students With Classes
Attribute refunded revenue to acquisition cohorts
Resolve Primary Author Across Legacy And New Schema
Books Whose Peak Simultaneous Loans Exceed Copies
Conflicting Room Reservations
Other topics
Array
414
Math
223
String
204
Dynamic Programming
142
Hash Table
125
SQL
116
Tree
93
Matrix
83
Sorting
83
Simulation
66
Greedy
65
Binary Search
61
Machine Learning
59
Two Pointers
57
Stack
50
Graph
49
Data Engineering
48
Bit Manipulation
47
Heap
47
Sliding Window
44
Prefix Sum
42
Aggregation
38
Design
37
Backtracking
32
Linked List
32
Breadth-First Search
30
Depth-First Search
27
Combinatorics
25
Statistics
25
Number Theory
24
Binary Search Tree
23
Intervals
23
Divide and Conquer
17
Union Find
17
Geometry
16
Recursion
16
Backend Systems
12
String Matching
12
Data Integrity
11
Shortest Path
11
Queue
10
Subqueries
9
Topological Sort
9
Trie
7
Game Theory
6
Window Functions
6
API
3
Brainteaser
3
Probability
3
Reliability
3
Library
Practice
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