Is inner join the same as equi-join?

Question

Can you tell me if inner join and equi-join are the same or not ?

Answer 1

The answer is YES, But as a resultset. So here is an example.

Consider three tables:

orders(ord_no, purch_amt, ord_date, customer_id, salesman_id)

customer(customer_id,cust_name, city, grade, salesman_id)

salesman(salesman_id, name, city, commission)

Now if I have a query like this:

Find the details of an order.

Using INNER JOIN:

SELECT * FROM orders a INNER JOIN customer b ON a.customer_id=b.customer_id 
INNER JOIN salesman c ON a.salesman_id=c.salesman_id;

Using EQUI JOIN:

SELECT * FROM orders a, customer b,salesman c where 
a.customer_id=b.customer_id and a.salesman_id=c.salesman_id;

Execute both queries. You will get the same output.

Coming to your question There is no difference in output of equijoin and inner join. But there might be a difference in inner executions of both the types.