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naive loop over 3 departments: 4 SQL statements (1 + 3)
SQL> select d1_0.id,d1_0.name from Department d1_0
SQL> select e1_0.department_id,e1_0.id,e1_0.city,e1_0.zip,e1_0.level,e1_0.name,e1_0.salary from Employee e1_0 where e1_0.department_id=?
SQL> select e1_0.department_id,e1_0.id,e1_0.city,e1_0.zip,e1_0.level,e1_0.name,e1_0.salary from Employee e1_0 where e1_0.department_id=?
SQL> select e1_0.department_id,e1_0.id,e1_0.city,e1_0.zip,e1_0.level,e1_0.name,e1_0.salary from Employee e1_0 where e1_0.department_id=?
with join fetch: 1 SQL statement
SQL> select distinct d1_0.id,e1_0.department_id,e1_0.id,e1_0.city,e1_0.zip,e1_0.level,e1_0.name,e1_0.salary,d1_0.name from Department d1_0 join Employee e1_0 on d1_0.id=e1_0.department_id