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Which two are true about the USING clause when joining tables?

Which two are true about the USING clause when joining tables?

A.

All column names in a USING clause must be qualified with a table name or table alias.

B.

It can never be used with onatural join.

C.

It is used to specify an equijoin of columns that have the same name in both tables.

D.

It can never be used with a full outer join.

E.

It is used to specify an explicit join condition involving operators.

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