Practice/SQL

Choose SQL practice

Choose how to practise: solve a work request, complete a checked challenge, write your own SQL or explore the data. No account required.

Practice company
Explore your optionsFind Paths for your role

Choose your company

Each company has staff in all nine Functions, so there is work for every role. You can move company at any time, and your progress at each one is kept in this browser.

  • Delft, Netherlands · EUR

    Raket Parts B.V.

    Makes precision rocket parts: valves, tanks, structures and flight computers for universities, industry and rocket builders.

    • €74.0minvoiced in 2025
    • 8,727orders in 2025
    • 491customers

    18 tables, 144,790 rows: customers, customer_invoices, credit_notes, supplier_invoices and the people, finance and IT tables every company has.

  • Luleå, Sweden · SEK

    Nord Signal AB

    Runs seven ground stations in Sweden and Norway that talk to satellites, plus a rocket test site and mission software.

    • SEK 618minvoiced in 2025
    • 290,000satellite passes in 2025
    • 31antenna dishes

    20 tables, 45,940 rows: customers, customer_invoices, credit_notes, supplier_invoices and the people, finance and IT tables every company has.

  • Glasgow, Scotland · GBP

    Skye Ascent Ltd

    Builds small rockets and launches satellites from Scotland, on dedicated launches or shared seats.

    • GBP 129minvoiced in 2025
    • 10launches flown since 2024
    • 25launches planned

    17 tables, 16,572 rows: customers, customer_invoices, supplier_invoices, products and the people, finance and IT tables every company has.

  • Alta, Norway · NOK

    Alta Sky Centre AS

    A public observatory and planetarium: northern lights evenings, shows, school groups, members and a café.

    • NOK 219msales in 2025, all channels
    • 168,816visitors at shows and evenings in 2025
    • 23,357active members

    18 tables, 61,773 rows: customers, customer_invoices, supplier_invoices, products and the people, finance and IT tables every company has.

  • Denver, United States · USD

    Liberty Orbit Inc.

    Sells satellite imagery and data to farms, insurers and governments, mostly as yearly subscriptions.

    • USD 210mannual recurring revenue (ARR)
    • USD 184minvoiced in 2025
    • 9,573customers

    19 tables, 63,993 rows: customers, customer_invoices, credit_notes, supplier_invoices and the people, finance and IT tables every company has.

Your desk at Raket Parts B.V.

Nine requests are waiting, one from each Function. Open one, ask the colleague what you need to know, then send your answer.

A short challenge

One harder question on the Raket Parts B.V. data. Your answer is checked against the data.

Challenge

Free practice

Write any query on the Raket Parts B.V. tables. No marking, run anything.

or Ctrl + Enter

This box has its own copy of the data, so you can change or delete rows without affecting anything else. Reset brings back the starting data and query.

Your saved queries

Kept in this browser on this device, so you can come back to them.

    The Raket Parts B.V. tables