Dataford
Interview QuestionsInterview GuidesExperiencesMock InterviewsPricing
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 feedbackSuccess 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
Rolling 7-Day Dropped Calls
00:00
5 left

Rolling 7-Day Dropped Calls

MediumSQL · PostgreSQL

Problem

Write a query to calculate the rolling 7-day average of dropped calls per agent for Aircall.

Use the agents and calls tables. Treat calls with status = 'dropped' as dropped calls and include calendar days with zero dropped calls. Return only dates with a full seven-day lookback window and at least one call for the agent.

Output

  1. One row per agent and qualifying date.
  2. Columns: agent_id, agent_name, call_date, daily_dropped_calls, and rolling_7_day_average.
  3. Sort by agent_id, then call_date ascending.

Schema

agents
ColumnTypeDescription
agent_idPKINTUnique Aircall agent identifier
agent_nameVARCHAR(100)Agent display name
calls
ColumnTypeDescription
call_idPKINTUnique call identifier
agent_idINTAgent assigned to the call
call_started_atTIMESTAMPTimestamp when the call started
statusVARCHAR(20)Call outcome, such as dropped or answered
Tablesagentscalls
Interviewer

Your question is Rolling 7-Day Dropped Calls. 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.