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In which two cases would you use an outer join? ()

发布日期:2021-08-10

In which two cases would you use an outer join? ()
A

The tables being joined have NOT NULL columns.

B

The tables being joined have only matched data.

C

The columns being joined have NULL values.

D

The tables being joined have only unmatched data.

E

The tables being joined have both matched and unmatched data.

F

Only when the tables have a primary key/foreign key relationship.

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