← SQL lessons
Free SQL playground
Run any query on the company database. You can't break anything: “Reset data” restores everything.
Ctrl + Enter to run
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Tables and columns (tap to insert)
Departments
- PK
Employees
- PK
- → departmentsFK
- → employeesFK
Customers
- PK
Products
- PK
Orders
- PK
- → customersFK
- → employeesFK
Order lines
- → ordersPK FK
- → productsPK FK