第4题: [单项选择]SQL查询语句中,用来实现关系的投影运算的短语是 A. WHERE B. FROM C. SELECT D. GROUP BY 参考答案:C 答案解析:[命题目的] 本题考查了考生对SQL语句结构的记忆及理解。 [解题要点] 掌握基本的SQL查询语句中,各个短语的含义。SELECT用于实现关系的投影操作,使用时将所选的字段名放在SELECT之后
第23题: [简答题]part 2 & 3Describe an outdoor activity
Do you like indoor activities or ourdoor activities
What is the difference
Nowadays people are busy with their work or study, how could we make good use of time to do outdoor activities 参考答案: