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DevEval
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Practice
Problems
Subqueries
Topic
Subqueries problems
9 problems: 5 Easy, 4 Medium.
Easy (5)
Customers Without Orders
Delete Duplicate Emails
Find Team Size
Sales Person
Biggest Single Number
Medium (4)
Second Highest Salary
Department Highest Salary
Rank Scores
Immediate Food Delivery
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
Joins
18
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
Topological Sort
9
Trie
7
Game Theory
6
Window Functions
6
API
3
Brainteaser
3
Probability
3
Reliability
3
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