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Answer Posted / padmas
In software, database systems, for example in Oracle there are tables in which primary key and secondary key exist. and on tables data there are operation will be performed such as ,join, merge, delete or add tables. Two tables will be joined where there is primary exists in a table and a corresponding secondary table in another table. Only then we can perform "join" operation using two tables. As this is a question related to software, the join operation is done this way.
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