What is the differecne between equi-join and inner-join and
natural join..Is there any difference or all are same?

Answer Posted / sandy

Inner join can have equality (=) and other operators (like <,>,<>) in the join condition.
Equi join only have equality (=) operator in the join condition.
Equi join can be an Inner join, Left Outer join, Right Outer join
The USING clause is not supported by SQL Server and Sybase. This clause is supported by Oracle and MySQL.

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