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A comment on Show HN: Learn to Code for Free. Parent comment
- When you have multiple layers of "companies" ( in a single table: Company) and every company has employees (table: Employee).
Request:
- List all company employees that have a random company as mother company, including their childs, all layers deep.
So you create a optional integer parentCompanyId on the Company for the inheritance ( that's easy)
How would you go further?
- You may not use a recursion of sql Queries (or in code) to procedurally get the parentCompany or "child companies" of all layers deep.
- You may change the database ( and you may use joins also)
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- When you have multiple layers of "companies" ( in a single table: Company) and every company has employees (table: Employee).
Request:
- List all company employees that have a random company as mother company, including their childs, all layers deep.
So you create a optional integer parentCompanyId on the Company for the inheritance ( that's easy)
How would you go further?
- You may not use a recursion of sql Queries (or in code) to procedurally get the parentCompany or "child companies" of all layers deep.
- You may change the database ( and you may use joins also)