Nested Cursors in Mysql

Question

I have three tables.
Project(Id), attribute(Id), project_attribute(Id, project_id, attribute_id).

I want to create records in project_at

Answer 1

Quite bluntly, nested cursors are (usually) a terrible idea. You can get what you want directly, without using a cursor, by using a normal CROSS JOIN.

INSERT INTO proj_attr (project, attribute)
    SELECT p.id AS projectid, a.id AS attributeid
    FROM project p CROSS JOIN attribute a;