Question

A join operation: causes two tables with a common attribute to be combined into a single table or view.

1) causes two tables with a common attribute to be combined into a single table or view
2) causes two tables with a common attribute to be combined into a single table or view, the common attribute must be a prime key in both tables
3) brings together data from two different fields
4) is used to combine indexing operations

Answer 1

A join operation is a method used in databases to combine two tables with a common attribute into a single table or view. It allows for the retrieval of data from two different fields and consolidating them into one table.

Step-by-step explanation:

A join operation is a method used in databases to combine two tables with a common attribute into a single table or view. The common attribute can be any field that exists in both tables, not necessarily a primary key. This operation allows for the retrieval of data from two different fields and consolidating them into one table.