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New Interview Questions: July 2026

Questions added to the Dataford question bank in July 2026, ranked by how often they are asked in real interviews.

100questions
~38htotal time
2,756companies covered
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1
CodingStart here. 50 questions · ~1125 min
Linked List ReversalEasy
Practice
Recently asked

Reverse a singly linked list in-place using iterative pointer manipulation.

RecursionLinked ListsArraysA S S E M B L E DCrescent Electric SupplyCenterWell
Implement Binary SearchEasy
Practice
Recently asked

Implement binary search to find a target value in a sorted array in O(log n) time.

Recursionbinary searchArraysHHAeXchangeEDF RenewablesSRS Consulting
First Non-Repeating CharacterEasy
Practice
Recently asked

Find the first non-repeating character in a string using frequency counting and a second pass in O(n) time.

Hash TablesStringsSearchingCloudsekBrightside HealthMcAfee
Longest Substring Without RepeatsMedium
Practice
Recently asked

Find the longest substring with all unique characters using a sliding window.

Hash TablesStringsTwo PointersDeepInstinctTaboolaEDF Renewables
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2
SQL & Data Manipulation50 questions · ~1125 min
Second Highest Trader SalaryEasy
Practice
Recently asked

Find the second highest distinct salary from a single table using basic PostgreSQL ordering and limiting.

SubqueriesRankingSortingeClinicalWorksNNeenOpal CanadaInformatica
Second Highest Without AggregatesHard
Practice
Recently asked

Find the second highest salary in each department without using aggregate functions.

SubqueriesRankingSelf-JoinsCredit GenieDevoteamCisco Restaurant + Bar
Handling Missing DataEasy
Practice
Recently asked

Replace missing sales fields with defined defaults and return a consistently ordered dataset.

missing valuesdata cleaningnull handlingUniversity of MinnesotaThe Home DepotNationwide
Optimize a Slow SQL QueryHard
Practice
Recently asked

Rewrite a slow PostgreSQL loan payment query to reduce scanned rows while preserving the required aggregated results.

database optimizationJoinsData WranglingBiz2CreditAmeripriseEEltro Cyberchrome Private
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