There are 4 tables:
Shops, Textbooks, Supplies, Schools.

What is the relationship between them?

Магазины - Учебники - М : М Магазины - Поставки - 1 : М Школы - Поставки - М : 1

So or am I wrong?

Specification: Deliveries are the table in which the date and quantity of deliveries is recorded.

  • And what is the supply? - Visman
  • The table in which the date and number of deliveries is recorded - Gregory Makedonsky
  • I vote for the closure of this question as not relevant to the topic, because the question is about the domain, not about programming. - D-side

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