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Oracle Coding Interview Questions

We track 320 coding questions asked at Oracle, tagged with the algorithms and concepts they test. The most common: Array, String, Hash Table, Dynamic Programming, Sorting.

Browse all 320 Oracle questions →

Concept mix

Each question's weight is split evenly across its concepts, so the shares sum to 100%.

Array — 17.1%String — 10.8%Hash Table — 6.4%Dynamic Programming — 5.5%Math — 4.9%Two Pointers — 4.6%Linked List — 4.5%Binary Search — 3.9%Sorting — 3.5%Breadth-First Search — 3.0%Other (46) — 36.0%

How many questions involve each concept

Share of all 320 tracked Oracle questions that touch each concept. Questions usually involve several, so these overlap.

Where Oracle differs from the average company

Concept weight at Oracle relative to the average across all companies we track. Green means Oracle leans on it harder than most.

Oracle specialties

Concepts that show up at Oracle but are rarely asked elsewhere. They are easy to get blindsided by.

Difficulty mix

Level split of the 320 tracked Oracle questions.

  • Junior20% (63)
  • Mid/Senior62% (197)
  • Staff19% (60)

Every concept in Oracle interviews

ConceptQuestions% of questionsShare of mix
Array15648.8%17.1%
String8125.3%10.8%
Hash Table6720.9%6.4%
Dynamic Programming4815.0%5.5%
Sorting4112.8%3.5%
Math4012.5%4.9%
Two Pointers3912.2%4.6%
Binary Search3611.2%3.9%
Depth-First Search3510.9%2.9%
Breadth-First Search3410.6%3.0%
Greedy319.7%3.0%
Linked List309.4%4.5%
Stack268.1%3.0%
Matrix237.2%2.1%
Tree237.2%2.0%
Binary Tree226.9%2.0%
Heap (Priority Queue)206.2%1.6%
Backtracking175.3%1.9%
Recursion154.7%1.8%
Counting144.4%1.0%
Design144.4%1.2%
Prefix Sum144.4%1.3%
Simulation134.1%1.4%
Graph Theory123.8%1.2%
Divide and Conquer113.4%0.8%
Bit Manipulation103.1%1.1%
Sliding Window103.1%0.9%
Monotonic Stack82.5%0.7%
Trie82.5%0.6%
Union-Find72.2%0.5%
Topological Sort51.6%0.4%
Binary Search Tree41.2%0.3%
Enumeration41.2%0.4%
Memoization41.2%0.3%
Merge Sort41.2%0.2%
Queue41.2%0.3%
Bucket Sort30.9%0.1%
Combinatorics30.9%0.3%
Doubly-Linked List30.9%0.3%
Ordered Set30.9%0.2%
Quickselect30.9%0.2%
Database20.6%0.7%
Number Theory20.6%0.3%
Segment Tree20.6%0.1%
Binary Indexed Tree10.3%0.0%
Counting Sort10.3%0.0%
Data Stream10.3%0.1%
Geometry10.3%0.0%
Hash Function10.3%0.1%
Interactive10.3%0.1%
Monotonic Queue10.3%0.1%
Radix Sort10.3%0.0%
Randomized10.3%0.1%
Shortest Path10.3%0.1%
Sort10.3%0.1%
String Matching10.3%0.2%

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