The join condition is generally composed of an equality comparison between the foreign key and the primary key of related tables.
The inner join is a type of join condition that can return a row match with values. This type of join returns those records which have matching values in both tables.
So, if you perform an inner join operation between the Employee table and the Projects table, all the tuples which have matching values in both tables will be given as output.
Therefore, the join condition is generally composed of an equality comparison between the foreign key and the primary key of related tables.
To learn more about foreign keys, refer to the link:
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