what about equi join, non equi join, natural join, cross join?

Answer 1

when ever we need access data from more than one table then we use JOINS
EQUI join- suppose I have employee and department table those contain depatment_id of employees... when we join both the table its match department_id from both table and result will display..

Answer 2

non-equi join- is same as vice versa

Answer 3

equi join is also known as natural join and simple join

Answer 4

you can speak english ?

Answer 5

yes...I think u dont understand my english..first learn english and then learn Sql