【单选题】Set operation of relation S and relation R. The result includes both tuples in S and tuples in R. This set operation is called ( ). A. union operation B. intersection operation C. difference op
【单选题】Set operation of relation S and relation R. The result includes both tuples in S and tuples in R. This set operation is called ( ).
A、 union operation
B、 intersection operation
C、 difference op
发布时间：2025-11-20 16:38:03
