A. More and more students have part-jobs out of campus.
B. The population of university students having part-time jobs is increasing quickly.
C. Part-timejobs can foster university students' sense of competition.
D. More people support students to have part-time jobs.
第1题:
A.POPULATE_LIST
B.POPULATE_GROUP
C.POPULATE_LIST_ITEM
D.POPULATE_LIST_FROM_GROUP
E.POPULATE_LIST_ITEM_FROM_GROUP
第2题:
对由SELECT--FROM—WHERE—GROUP--ORDER组成的SQL语句,其在被DBMS处理时,各子句的执行次序为()
A.SELECT—FROM—GROUP—WHERE—ORDER
B.FROM——SELECT--WHERE——GROUP——ORDER
C.FROM——WHERE——GROUP——SELECT——ORDER
D.SELECT——FROM——WHERE——GROUP——ORDER
第3题:
第4题:
若查询的结果仅限于平均分数超过80分的,则应( )。A.在GROUP子句的下一行加入:HAVING AVG(grade)>80B.在GROUP子句的上一行加入:HAVING AVG(grade)>80C.在FROM子句的下一行加入:HAVING AVG(grade)>80D.在FROM子句的上一行加入:HAVING AVG(grade)>80
第5题:
第6题:
Service通信与Topic通信最主要的区别在于:Service是异步通信,Topic是同步通信。