What is the differecne between equi-join and inner-join and
natural join..Is there any difference or all are same?
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Answer Posted / sobia g.
An inner join is a join with a join condition that may contain both equality or non-equality sign whereas an equijoin is a join with a join condition that only contain only equality sign.
So we can say an equijoin is a type of inner join containing (Equal)= operator in the join condition.
It is good to know the difference between join and INNER JOIN keywoed. Actually there is no difference. If we write JOIN then by default INNER JOIN is performed. In the example it is also shown.
The following example will make you more clear.
In this example I used data as in example of Difference between Inner join and Outer join
SQL> select s.name,d.deptname from dept d, student s where d.deptid=s.deptid;
NAME DEPTNAME
--------------- ----------
Rafi CSE
Arju CSE
This example represents both INNER join and equijoin.
SQL> select s.name,d.deptname from dept d INNER JOIN student s on d.deptid=s.deptid;
NAME DEPTNAME
--------------- ----------
Rafi CSE
Arju CSE
Above example also represents both INNER join and equijoin.
SQL> select s.name,d.deptname from dept d INNER JOIN student s on d.deptid<>s.deptid;
NAME DEPTNAME
--------------- ----------
Rafi EEE
Raju EEE
Arju EEE
Raju CSE
Above example represents an inner join but not a equijoin.
SQL> select s.name,d.deptname from dept d JOIN student s on d.deptid<>s.deptid;
NAME DEPTNAME
--------------- ----------
Rafi EEE
Raju EEE
Arju EEE
Raju CSE
Above example show JOIN and INNER join keyword is same. If we don't specify INNER then by default inner join is performed.
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