Summary – Inner Join vs Natural Join The key difference between inner join and natural join is that inner join provides the result based on the matched data according to the equality condition specified in the SQL query while natural Join provides the result based on the column with the same name and same data type present in tables to be joined.
An inner join is a join of two or more tables that returns only those rows (compared using a comparison operator) that satisfy the join condition. This clause is supported by Oracle and MySQL. Now coming to Natural join vs. Equijoin, to simplify, Equi Join is a join using one common column (referred to in the “on” clause).
It is done over the Cartesian Product of the two operand relations, using a SELECT statement with a Predicate.We are familiar with Joins like INNER JOIN, OUTER JOIN and CROSS JOIN but initially there were introduced with types like Theta Join, Equijoin, Natural Join, Outer Join and Semijoin. The natural join is a special case of an equi-join. In the WHERE clause of an equi-join, a column from one source table is compared with a column of a second source table for equality. Natural join.
We have already learned that an EQUI JOIN performs a JOIN against equality or matching column (s) values of the associated tables and an equal sign (=) is used as comparison operator in the where clause to refer equality. An equijoin is a join with a join condition containing an equality operator. An equijoin returns only the rows that have equivalent values for the specified columns. The SQL NATURAL JOIN is a type of EQUI JOIN and is structured in such a way that, columns with the same name of associated tables will appear once only. The two columns must be the same type and length and must have the same name. Natural Join. Equi join can be an Inner join, Left Outer join, Right Outer join; The USING clause is not supported by SQL Server and Sybase. A natural join is a type of equi join which occurs implicitly by comparing all the same names columns in both tables.
Equi join only have equality (=) operator in the join condition.
Join is one of the main operations we perform against relations (tables) for retrieving data.
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