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
Second-Highest Per Warehouse
00:00
5 left

Second-Highest Per Warehouse

MediumSQL · PostgreSQL

Problem

Write a SQL query using window functions to find the second-highest sales volume day for each warehouse at Zebra Technologies.

Use the warehouses and sales tables. Treat the second-highest volume as the second distinct daily total, and include tied days at that level.

Output

  1. One row per qualifying warehouse and date, with warehouse_id, warehouse_name, sale_date, and sales_volume.
  2. Include only warehouses with a second-highest day, ordered by warehouse_id and sale_date.

Schema

warehouses
ColumnTypeDescription
warehouse_idPKINTEGERUnique warehouse identifier
warehouse_nameVARCHAR(100)Warehouse name
regionVARCHAR(50)Operational region for the warehouse
sales
ColumnTypeDescription
sale_idPKINTEGERUnique sales record identifier
warehouse_idINTEGERWarehouse associated with the sale
sale_dateDATEDate on which the sale occurred
units_soldINTEGERNumber of units sold in the record
Tableswarehousessales
Interviewer

Your question is Second-Highest Per Warehouse. 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.