2 According to the survey, what jobs are available to those dropouts? A. Jobs that are very dangerous. B. Jobs that are low-paying and boring. C. Jobs that have little chance of success. D. Jobs that require long working hours.
A.
B.
C.
D.
D
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举一反三
【单选题】以下定义的4个视图中,能够进行更新操作的是________
A.
CREATE VIEW S_MALE(学号,姓名) AS SELECT 学号,姓名 FROM student WHERE 班号='09031'
B.
CREATE VIEW S_G(学号,姓名,课程名,分数) AS SELECT S.学号,姓名,课程名,分数 FROM student S,score SC,course C WHERE S.学号=S