what is the difference between join keyword and inner join keyword in oracle sql? -

this question has answer here:

• difference between join , inner join 7 answers

i can't find documentations on key word join saw examples on web using it.

i doing experiment in oracle hr schema, have table departments:

• deparment_name
• manager_id
• location_id

a table employees:

• first_name
• employee_id

and table locations:

• location_id
• city

query should return department_name, first_name of manager of department, , city department located.

the code using keyword join seem return result in comparison using keyword inner join

code join:

select d.department_name, e.first_name,l.city departments d    join employees e on d.manager_id=e.employee_id    join locations l on d.location_id=l.location_id 

code inner join:

select d.department_name, e.first_name,l.city departments d    inner join employees e on d.manager_id=e.employee_id    inner join locations l on d.location_id=l.location_id 

is there difference between 2 condition, or happen stumble on situation return same results?

• following 1992 ansi sql reference, inner optional:

query expressions 179 7.5 - joined table

3) if qualified join specified , join type not specified, inner implicit.

• following oracle standards (9i onward), inner prefix optional. before 9i, oracle didn't follow ansi rules, , didn't support join syntax.