@ Symbol - a solution for Recursive SELECT query in Mysql?

Question

there are a lot of questions about Recursive SELECT query in Mysql, but most of answers is that \"There NO solution for Recursive SELECT query in Mysql\".

Actually t

Answer 1

In my limited deep of hierarchy-levels, I used the following:

parents:

select * from mytable
join (
    select A.id Aid,B.id Bid, C.id Cid, D.id Did, E.id Eid, F.id Fid,G.id Gid, H.id Hid from mytable A
    left join mytable B on B.id=A.parent
    left join mytable C on C.id=B.parent
    left join mytable D on D.id=C.parent
    left join mytable E on E.id=D.parent
    left join mytable F on F.id=E.parent
    left join mytable G on G.id=F.parent
    left join mytable H on H.id=G.parent
    where A.id=9
) X
where id in (Aid,Bid,Cid,Did,Eid,Fid,Gid,Hid);

children:

select * from mytable where id in (
select distinct id from mytable
join (
    select A.id Aid,B.id Bid, C.id Cid, D.id Did, E.id Eid, F.id Fid,G.id Gid, H.id Hid FROM mytable A
    left join mytable B on B.parent=A.id
    left join mytable C on C.parent=B.id
    left join mytable D on D.parent=C.id
    left join mytable E on E.parent=D.id
    left join mytable F on F.parent=E.id
    left join mytable G on G.parent=F.id
    left join mytable H on H.parent=G.id
    Where A.id=1
) X
where id in (Aid,Bid,Cid,Did,Eid,Fid,Gid,Hid)

);