SQL Quest › SQL Interview Prep › DoorDash
Candidates describe a 60-minute technical screen split into a SQL half and a marketplace case — several short SQL questions against the clock, on order and delivery tables. Practise that shape here, on data that looks like it.
18 practice challenges · 4 Easy / 7 Medium / 7 Hard · 12 play free · runs in the browser
DoorDash does not publish the format. Each row is what candidates and prep guides have described publicly, with its source; where sources disagree, the row says so. Formats change — treat every specific as reported, not official.
| Roles where SQL is tested | Data Science, Analytics and Data Engineering.[4] |
|---|---|
| Stages | Recruiter screen, a 60-minute technical screen, then a final round of about four interviews (cross-functional, hiring manager, data science).[1] |
| The technical screen | Reported as roughly 30 minutes of SQL and 30 minutes of a product or marketplace case. One candidate report describes four SQL questions of rising difficulty in the SQL half.[1][2] |
| Environment | Candidates report the SQL is written live and not executed, so correctness has to be reasoned, not tested by running it. The tool is not named in any source we could read.[2][1] |
Sources: Exponent — DoorDash Data Scientist interview guide (candidate reports) (updated mid-2026); Blind — DoorDash data science phone screen thread (27 Jul 2022); StrataScratch — DoorDash SQL interview questions (updated 6 Mar 2026); DataLemur — DoorDash SQL interview questions (8 May 2025). Accessed 13 Sep 2026.
Reported most often, in order
Difficulty: Reported as medium, delivered fast: the pressure is the clock, not the trick. The data is orders (customer, restaurant, totals, timestamps), deliveries (predicted vs actual delivery time, status) and dashers (ratings, distance).
Our DoorDash practice set, by skill
The 18 SQL Quest challenges tagged DoorDash, resolved onto the nine Skillmap skills. A challenge exercises several skills, so shares do not sum to 100%. This is the composition of the practice set on this page, not a measurement of DoorDash’s interview.
Shapes candidates and guides report (paraphrased)
Practise now — SQL Quest challenges matched to those patterns
Our challenges, chosen because their SQL matches the shapes above; not questions DoorDash has asked. Each card opens the challenge in the browser — no signup.
Skillmap
Ten questions, no signup. You get a readiness score weighted to the SQL this page covers, your Skillmap across joins, window functions, aggregation and the rest, and the weakest skill to practise first.
Drill the skills the DoorDash set leans on, one at a time: GROUP BY exercises · Date function practice · Window function practice · CTE practice · JOIN practice — or browse every SQL practice question.
Every question in the DoorDash set, one page each with the schema and a hint: Monthly Order Count · January 2024 Orders · JOIN with a Filter · LEFT JOIN: Watch the NULLs Appear · Monthly Order Trends · Monthly Order Volume in 2024 · Month-over-Month Customer Growth · Day-of-Week Order Pattern (strftime) · Most Recent Order Per Customer (ROW_NUMBER) · The Previous Order's Total (LAG) · Running Total of Orders · 7-Day Rolling Revenue Average · First and Last Order per Customer · Top Spender Per Country · Detect Repeat Buyers Within 7 Days · Daily Active Customers · Month-over-Month Revenue Growth · Customer Retention Cohort.
No signup, no card. Start with the free challenges in the set; the Skillmap shows what to fix before the interview.
Start the DoorDash set — free