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Which two statements are true regarding the USING clause in table joins?（）
A:It can be used to join a maximum of three tables 
B:It can be used to restrict the number of columns used in a NATURAL join 
C:It can be used to access data from tables through equijoins as well as nonequijoins 
D:It can be used to join tables that have columns with the same name and compatible data types

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出自：Oracle认证

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