MySQL Getting around error 1093

Question

Error 1093 states that you can\'t UPDATE or DELETE using a subquery if your subquery queries the table you are deleting from.

So you can\'t do

delete         


        

Answer 1

You can do

delete t1,t2 
FROM  table1 t1  
INNER JOIN 
table1 t2 ON (t2.something = t1.id);

For the query in the question, this should be equivalent:

delete A
from adjacencies A
join adjacencies B ON A.parent = B.parent AND B.child=@me AND B.parent != @me
join adjacencies C ON A.child = C.child AND C.parent=@me