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Task 29:
Your task is to perform a two-step data migration:
  1. Add a new column named acquired_at to the machine table. This column should be of the DATE data type.
  2. Update all records in the machine table:
    • Populate the newly created acquired_at column by extracting the date value from the acquired field within the details JSON column.
    • After successful extraction, remove the acquired field from the details JSON column.

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"}