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The Basics of Creating Tables in SQL

Introduction
Foreign keys
Multi-column Foreign Keys
Summary
19. Question 2

Instruction

Nice! Let's tackle another problem.

Exercise

Based on the ERD below, create the purchase_position table.

LEAD

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Type:

CREATE TABLE purchase_position (
  purchase_id integer NOT NULL,
  item_id integer NOT NULL,
  seq integer NOT NULL,
  PRIMARY KEY (purchase_id, item_id, seq),
  FOREIGN KEY (purchase_id)
    REFERENCES purchase(id),
  FOREIGN KEY (item_id)
    REFERENCES item(id)
);