Amazon
Medium
Data ScientistProcess real-time enter/exit events and actives
Data Manipulation (SQL/Python)
0
0
October 13, 2025
SQL Date and Time Function Interview Questions
Date and time questions test how you group, compare, and analyze time-based data.
Expect DATE_TRUNC, DATEDIFF, EXTRACT, and rolling window logic for cohorts or retention.
Interviewers look for correct boundaries, time zones, and type conversions.
201Questions
54Companies
Common SQL date and time interview patterns
- Grouping by day, week, or month with DATE_TRUNC
- Cohort analysis and retention windows
- Rolling 7-day or 30-day metrics
- Date range joins and interval filters
- Time zone conversions and casting
SQL date and time interview questions
Filter and sort
PayPal
Medium
Data ScientistWrite SQL to flag Venmo ATO
Data Manipulation (SQL/Python)
0
0
October 13, 2025
Meta
Medium
Data ScientistWrite SQL for social feed metrics and ties
Data Manipulation (SQL/Python)
0
0
October 13, 2025
DoorDash
Medium
Data ScientistWrite SQL to backtest refund policy
Data Manipulation (SQL/Python)
0
0
October 13, 2025
Airbnb
Medium
Data ScientistBuild panel in SQL; run causal regression
Data Manipulation (SQL/Python)
0
0
October 13, 2025
Roblox
Medium
Data ScientistCompute CTR, RPM, and daily RPM variability in SQL
Data Manipulation (SQL/Python)
0
0
October 13, 2025
Roblox
Medium
Data ScientistWrite SQL for ads metrics and variability
Data Manipulation (SQL/Python)
0
0
October 13, 2025
Roblox
Medium
Data ScientistCompute ARPDAU/ARPPU by country
Data Manipulation (SQL/Python)
0
0
October 13, 2025
Roblox
Medium
Data ScientistWrite SQL to flag suspect payments and chargebacks
Data Manipulation (SQL/Python)
0
0
October 13, 2025
Twitch
Medium
Data ScientistWrite robust SQL for streaming analytics
Data Manipulation (SQL/Python)
0
0
October 13, 2025
DoorDash
Medium
Data ScientistWrite complex SQL on DoorDash data
Data Manipulation (SQL/Python)
0
0
October 13, 2025
Intuit
Medium
Data ScientistCompute paid subscriber YoY counts by month
Data Manipulation (SQL/Python)
0
0
October 13, 2025
Upstart
Medium
Data ScientistSolve SQL CTR and Python analytics tasks
Data Manipulation (SQL/Python)
0
0
October 13, 2025
Pinterest
Medium
Data ScientistCompute CTR by pin_format for new US users
Data Manipulation (SQL/Python)
0
0
October 13, 2025
Freddie Mac
Medium
Data ScientistDesign SQL cleaning, mapping, dedupe, and keying
Data Manipulation (SQL/Python)
0
0
October 13, 2025
Twitch
Medium
Data ScientistSolve advanced SQL for streaming analytics
Data Manipulation (SQL/Python)
0
0
October 13, 2025
Point72
Medium
Data ScientistWrite SQL for recent customer activity
Data Manipulation (SQL/Python)
0
0
October 13, 2025
Meta
Medium
Data ScientistCompute multi-account actives and unread coverage
Data Manipulation (SQL/Python)
0
0
October 13, 2025
DoorDash
Medium
Data ScientistWrite SQL for cuisine median delivery times
Data Manipulation (SQL/Python)
0
0
October 13, 2025
Meta
Medium
Data ScientistJoin datasets and compute conversion by assignment
Data Manipulation (SQL/Python)
0
0
October 13, 2025
Common mistakes with SQL date and time
- Off-by-one errors in date ranges
- Mixing timestamps and dates without casting
- Ignoring time zone conversion rules
- Using inclusive vs exclusive bounds incorrectly
- Assuming all months have the same length
How date and time questions are evaluated in interviews
Correct boundaries and conversions matter more than fancy functions.
Explain how you define windows and handle missing dates.
Call out any time zone assumptions explicitly.