因此，连接行集数是两个行集的行集数的乘积，被选择的谓词连接的乘积。

Therefore, the join cardinality is the product of the cardinalities of two row sets, multiplied by the selectivity of the join predicate.

youdao

因此，连接行集数是两个行集的行集数的乘积，被选择的谓词连接的乘积。

Therefore, the join cardinality is the product of the cardinalities of two row sets, multiplied by the selectivity of the join predicate.

youdao