För att få alla barn till ämne 1 kan du använda
WITH RECURSIVE c AS (
SELECT 1 AS id
UNION ALL
SELECT sa.child_id
FROM subject_associations AS sa
JOIN c ON c.id = sa. parent_id
)
SELECT id FROM c;
För att få alla barn till ämne 1 kan du använda
WITH RECURSIVE c AS (
SELECT 1 AS id
UNION ALL
SELECT sa.child_id
FROM subject_associations AS sa
JOIN c ON c.id = sa. parent_id
)
SELECT id FROM c;