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SQLtest interactive SQL practice

Sharpen your SQL skills with our interactive exercises and assessments!
Practice a wide range of SQL tasks, from basic queries to advanced techniques. Get immediate feedback on your solutions, helping you learn from mistakes and improve your skills. Boost your confidence for job interviews and real-world SQL applications.
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Task 7: 
Write an SQL query to determine the total population size of each penguin species, breaking down the results by each unique island represented in the dataset.
The output should contain a species column and columns with island names in alphabetical order, displaying the abundance of each species on that island.

Use SQLite syntax to write your answer. Descriptions of tables are provided in the right pane.

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Querynomicon (SQLite)

A compact database for learning the basics of SQL.

The Querynomicon database contains tables:

department - table of departments.
  • identDepartment ID.
  • nameDepartment name.
  • buildingBuilding name.
ident name building
gen Genetics Chesson
little_penguins - table of little penguins.
  • speciesPenguin species.
  • islandIsland of residence.
  • bill_length_mmBill length, mm.
  • bill_depth_mmBill depth, mm.
  • flipper_length_mmFlipper length, mm.
  • body_mass_gBody mass, g.
  • sexSex.
species island bill_length_mm bill_depth_mm flipper_length_mm body_mass_g sex
Gentoo Biscoe 52.1 17 230 5550 MALE
penguins - table of penguins.
  • speciesPenguin species.
  • islandIsland of residence.
  • bill_length_mmBill length, mm.
  • bill_depth_mmBill depth, mm.
  • flipper_length_mmFlipper length, mm.
  • body_mass_gBody mass, g.
  • sexSex.
species island bill_length_mm bill_depth_mm flipper_length_mm body_mass_g sex
Gentoo Biscoe 52.1 17 230 5550 MALE
staff - table of employees.
  • identEmployee number.
  • personalEmployee first name.
  • familyEmployee last name.
  • deptDepartment.
  • ageAge.
ident personal family dept age
7 Abram Chokshi gen 23
machine - table of machines.
  • identMachine ID.
  • nameMachine name.
  • detailsJSON with details.
ident name details
1 WY401 {"acquired": "2023-05-01"}
2 Inphormex {"acquired": "2021-07-15", "refurbished": "2023-10-22"}
3 AutoPlate 9000 {"note": "needs software update"}