Explanation to join tables [closed]

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I have a task to do from the university and I need help. I need to join tables, are two tables employer and departament:

departament(id, description)

employer(id, name, age, dep_id);

I'm using oracle 11, could some friendly person give the way?

Answer 1

well... I think there is another topic like this, but let's help you.

The way is: you can use inner join...

Taking your example:

select * from employer inner join departament on employer.dep_id = departament.id;

taking the opportunity, I would like to suggest you to study also outer join, left join, right join and of course also inner join.

Answer 2

Do you need something like this? (the very easiest one)

SELECT * FROM EMPLOYER e, DEPARTAMENT d WHERE e.DEP_ID = d.ID

But I prefer using inner/outer/left/right joins :-)

For explanation see:

What is the difference between Left, Right, Outer and Inner Joins?