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A SELECT statement can be used to perform these three functions: 1. Choose rows from a table. 2. Choose columns from a table 3. Bring together data that is stored in different tables by creating a link between them. Which set of keywords describes these capabilities?（）
A:difference, projection, join
B:selection, projection, join
C:selection, intersection, join
D:intersection, projection, join
E:difference, projection, product

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出自：Oracle认证

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