I have to delete some rows from two tables which are connected with a foreign key on the basis of counts

Question

I have two tables called property and tanks, any property can have one or more than one contacts, in tanks table I have propertyid as foreign key. I want to delete the properties based on the number of tanks. Here is the query which is not working

DELETE  P FROM properties P
LEFT JOIN
(
   SELECT T.Id 
   FROM tanks T 
   GROUP BY T.PropertyID 
   HAVING COUNT(T.ID) = 2
 ) T ON T.PropertyId = P.ID 

Answer 1

Try below query:

DELETE p.* FROM properties p 
JOIN tanks t 
ON p.id=t.property_id 
GROUP BY t.property_id 
HAVING COUNT(t.id)=2;