Dataford
Interview QuestionsInterview GuidesExperiencesCoaching
New
Pricing
Get started
Dataford
Popular roles
Software EngineerData AnalystData ScientistData EngineerBusiness AnalystAI EngineerMachine Learning EngineerProduct Manager
Browse
Browse All RolesEvery role hub, from analyst to MLBrowse All CompaniesCompany-specific interview loopsAll Interview GuidesThe full guide library
Top questions by role
Software EngineerData AnalystData ScientistData EngineerBusiness AnalystAI EngineerMachine Learning EngineerProduct Manager
Top questions by skill
SQLPythonStatisticsMachine LearningA/B TestingSystem DesignGenerative AIProduct SenseMetricsBehavioral
Browse all questions →Try a mock interview
Experiences
Practice
Mock InterviewsTimed interview simulations with feedbackCoaching1:1 coaching with people at your target companiesSuccess PathYour 6-week structured planModulesCurated lessons by topicWebinarsTalks from ex-Big Tech data leadsPlaygroundA free-form scratch editor
Learn
BlogInterview strategy and career adviceTech Job Market ReportHiring trends across data and AI rolesFor UniversitiesDataford for career centersAbout DatafordWho we are and how we build
Pricing
Build my plan
SQL Top 10 Purchases Last Month
00:00
5 left

SQL Top 10 Purchases Last Month

EasySQL · PostgreSQL

Problem

Write a SQL query to find the top 10 most purchased items in the last month for Gametime United.

Use purchase records from the previous calendar month and count only completed purchases. Treat each completed purchase record as one item purchase.

Output

  1. One row per qualifying item, with columns item_id, item_name, and purchased_count.
  2. Include at most 10 items, ordered by purchased_count descending, then item_id ascending to break ties.

Schema

items
ColumnTypeDescription
item_idPKINTUnique identifier for a Gametime United item
item_nameVARCHAR(120)Display name of the item
categoryVARCHAR(60)Item category
purchases
ColumnTypeDescription
purchase_idPKINTUnique purchase record identifier
item_idINTPurchased item identifier
purchased_atDATEDate on which the purchase was recorded
statusVARCHAR(20)Purchase status
Tablesitemspurchases
Interviewer

Your question is SQL Top 10 Purchases Last Month. Start with the requirements and the two tables in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.

You need to log in / sign up to run or submit.
CodePostgreSQL
Sign up free to run your codeLog inLn 1
Run your query to see results here.