OHTU-German-learning-website/gradesa/data/migrations/00009_grammar_items.sql

CREATE TABLE grammar_items (
	id bigint PRIMARY KEY NOT NULL GENERATED BY DEFAULT AS IDENTITY,
	grammar_item TEXT NOT NULL,
	UNIQUE (grammar_item)
);

-- Table that joins grammar items and exercises
CREATE TABLE exercises_to_grammar_items (
	id bigint PRIMARY KEY NOT NULL GENERATED BY DEFAULT AS IDENTITY,
	grammar_item_id bigint,
	exercise_id bigint,
	FOREIGN KEY (grammar_item_id) REFERENCES grammar_items(id),
	FOREIGN KEY (exercise_id) REFERENCES exercises(id)
);