joins Interview Questions
2 interview questions in our bank cover joins, most of them Coding & Leetcode-style Questions. They average 3.0/5 difficulty — medium — and each one was reported by a candidate after a real interview. Companies known to ask about joins: Discord, DoorDash.
Practice these on the problems board →Companies that ask about joins
Question mix
- Coding & Leetcode-style Questions2
Difficulty
- 3/5 — medium2
Questions tagged joins
SQL Aggregation: Video Calls per Country per Day
3/5This database interview challenge, frequently reported at Discord, requires candidates to write efficient queries grouping large-scale telecommunication records by geographical region and chronological date. This assessment evaluates relational database manipulation, handling massive datasets, and writing performant aggregations. Access to the complete problem breakdown, optimal SQL queries, and performance tuning strategies requires a paid subscription.
Coding & Leetcode-style QuestionsDiscordDE/AE Screen: SQL + Python (Sliding Window + Joins)
3/5This comprehensive DoorDash technical screening combines relational database queries with an algorithmic Python task involving sliding windows and data aggregation. Candidates must demonstrate proficiency in writing complex analytical SQL statements utilizing window functions and conditional grouping, alongside implementing an efficient sequence processing script. It thoroughly assesses database design comprehension and algorithmic efficiency under time constraints. View the complete problem breakdown, query requirements, and model solutions by upgrading to a paid subscription.
Coding & Leetcode-style QuestionsDoorDash
Studied alongside
joins interview FAQ
- How many joins interview questions are there?
- 2 reported questions, mostly Coding & Leetcode-style Questions.
- Which companies ask joins questions?
- Discord (1), DoorDash (1).
- How hard are joins questions?
- They average 3.0 out of 5: 2 at 3/5.