Let R and S be the relation respectively:    The number of tuples that the result of the expression R co S (Here is the natura

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问题 Let R and S be the relation respectively:    

The number of tuples that the result of the expression R co S (Here is the natural join of relations R and S) is

选项 A、3
B、4
C、6
D、9

答案B

解析
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