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
Top Content by Unique Viewers
00:00
5 left

Top Content by Unique Viewers

EasySQL · PostgreSQL

Problem

Paramount+ analytics needs a quarterly ranking of content performance. Write a PostgreSQL query that identifies the five content pieces with the most unique viewers during Q2 2025, from April 1 through June 30.

Requirements

  1. Join content_catalog with viewing_events using content_id.
  2. Include viewing events where viewed_at is on or after 2025-04-01 and before 2025-07-01.
  3. Count distinct non-null viewer_id values for each content piece.
  4. Return the top five results, ordered by unique viewers descending, with content_id ascending as a deterministic tie-breaker.

Schema

content_catalog
ColumnTypeDescription
content_idPKINTEGERUnique content identifier
titleVARCHAR(150)Paramount+ content title
content_typeVARCHAR(30)Movie, series, or special
release_dateDATEOriginal release date
genreVARCHAR(50)Primary genre
viewing_events
ColumnTypeDescription
event_idPKINTEGERUnique viewing event identifier
content_idINTEGERReferenced content identifier
viewer_idINTEGERViewer identifier
viewed_atTIMESTAMPViewing timestamp
surfaceVARCHAR(30)Paramount+ viewing surface
Tablescontent_catalogviewing_events
Interviewer

Your question is Top Content by Unique Viewers. 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.