CREATE TABLE persons (
    id INTEGER NOT NULL PRIMARY KEY,
    first_name TEXT NOT NULL,
    last_name TEXT NOT NULL
);

CREATE TABLE instruments (
    id INTEGER NOT NULL PRIMARY KEY,
    name TEXT NOT NULL
);

CREATE TABLE works (
    id INTEGER NOT NULL PRIMARY KEY,
    composer INTEGER REFERENCES persons(id),
    title TEXT NOT NULL,
    part_of INTEGER REFERENCES works(id) ON DELETE CASCADE,
    part_index INTEGER
);

CREATE TABLE instrumentations (
    work INTEGER NOT NULL REFERENCES works(id) ON DELETE CASCADE,
    instrument INTEGER NOT NULL REFERENCES instruments(id) ON DELETE CASCADE
);

allPersons:
SELECT * FROM persons ORDER BY last_name;

personById:
SELECT * FROM persons WHERE id = :id LIMIT 1;

allInstruments:
SELECT * FROM instruments ORDER BY name;

instrumentById:
SELECT * FROM instruments WHERE id = :id LIMIT 1;

workById:
SELECT * FROM works WHERE id = :id LIMIT 1;

worksByComposer:
WITH RECURSIVE work_parts(id, part_of) AS (
    SELECT id, part_of FROM works WHERE composer = :composerId
    UNION ALL
    SELECT works.id, works.part_of FROM works
        JOIN work_parts ON works.id = work_parts.part_of
)
SELECT works.* FROM works
    JOIN work_parts ON works.id = work_parts.id
    WHERE work_parts.part_of IS NULL;

instrumentsByWork:
SELECT instruments.* FROM instrumentations
    JOIN instruments ON instrumentations.instrument=instruments.id
    WHERE instrumentations.work = :workId;