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 for Top Senders
00:00
5 left

SQL for Top Senders

MediumSQL · PostgreSQL

Problem

Given a table of transactions and a table of customer profiles, write a query to find the top 5% of senders by total volume in the last 30 days at Remitly.

Use completed transactions and match senders to their customer profiles. Treat ties at the 5% boundary as included.

Output

  1. One row per qualifying sender, with sender_id, customer_name, and total_volume.
  2. Include only transactions from the last 30 days and sort by total_volume descending, then sender_id ascending.

Schema

transactions
ColumnTypeDescription
transaction_idPKINTUnique transaction identifier
sender_idINTCustomer who initiated the transfer
amountNUMERIC(12,2)Transfer amount in the transaction currency
currencyVARCHAR(3)ISO currency code
transaction_statusVARCHAR(20)Processing status of the transaction
transaction_timestampTIMESTAMPTime the transaction was recorded
customer_profiles
ColumnTypeDescription
customer_idPKINTUnique Remitly customer identifier
customer_nameVARCHAR(150)Customer's display name
emailVARCHAR(255)Customer email address
country_codeVARCHAR(2)Customer's two-letter country code
Tablestransactionscustomer_profiles
Interviewer

Your question is SQL for Top Senders. 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.