【单选题】—What did he say just now? —He wondered___________________.
D.
whether he could join us or not
【单选题】What is the purpose of a semi-join?
A.
Increase the speed of the join for trade-off of increased data transmission cost.
B.
Increase the efficiency of sending data across multiple machines.
C.
Another name for join: an operation to combine two tables by column.
【单选题】—What _____ do you want to join? —I want to join the music club. [ ]
【简答题】What does the club need to let you join it? They just need ______.
【单选题】肝性脑病病人的饮食护理不正确的是( )。
D.
食物中应含多种维生素,但不宜用维生素B 6 。
【单选题】肝性脑病应用左旋多巴时不宜合用的维生素是( )
【单选题】What are the three computing steps of a semi-join?
B.
Project, Decompose, Send