Multiple choice technology programming languages

Which two statements are true regarding the USING clause in table joins?

  1. It can be used to join a maximum of three tables

  2. It can be used to restrict the number of columns used in a NATURAL join

  3. It can be used to access data from tables through equijoins as well as nonequijoins

  4. It can be used to join tables that have columns with the same name and compatible data types
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B,D Correct answer
Explanation

The USING clause restricts the columns compared in joins to specified shared columns, resolving ambiguity from NATURAL joins. It requires columns with the same name and compatible data types for equijoins. It cannot be used for nonequijoins or to join more than two tables directly.

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