In what order are ON DELETE CASCADE constraints processed?

Question

Here is an example of what I\'ve got going on:

CREATE TABLE Parent (id BIGINT NOT NULL,
  PRIMARY KEY (id)) ENGINE=InnoDB;

CREATE TABLE Child (id BIGINT NOT         


        

Answer 1

the design is all wrong. You should have single table, with parent child relationship (literrally). Then you can figure out uncles (and aunts) with a query

select id from persons where -find all children of the grandparents
parent id in (
select parentid from persons --find the grandparents
where id in (
select parentid from persons --find the parents
where id=THECHILD) )
minus --and take out the child's parents
select parentid from persons
where id=THECHILD