php - Multiple fields cascade mysql -

i have problem:

i have table "likes" structured this:

 -- likeid  -- elementid  -- elementtype 

the rest of table not important. let me explain table: likeid id of inserted like. elementid id of element being liked. elementid not unique, because elements can have different elementtypes , therefore ther field elementtype.

so let's this:

i element 1 of elementtype 0. (likeid, elementid, elementtype) values (1,1,0) mysql insert. element 1 of elementtype 1. be(likeid, elementid, elementtype) values (1,1,1)

now have 2 tables: table elementtype 0 , table elementtype 1. structured this:

 -- thiselementid  -- blabla other fields not important 

and

 -- otherelementid  -- blabla other fields not important 

what want on delete cascade. when delete element 1 of elementtype 0 part of thiselementid-table, should delete it. problem is, element 1 of elementtype 1 has same id value (otherelementid).

how can manage work? hope understand mean! :)

create triggers each table:

delimiter //  create trigger extra0_del after delete on extra0 each row begin   delete likes elementid = old.thiselementid , elementtype = 0; end; //  create trigger extra1_del after delete on extra1 each row begin   delete likes elementid = old.otherelementid , elementtype = 1; end; //  delimiter ; 

replace extra0 , extra1 names of tables.