It’s been calculated that by the age of 18
举一反三
- It’s been calculated that by the age of 18, the average American will have seen 600,000 ads; by the age of 40, the total is almost one million.
- 设有关系表S(NO，NAME，AGE)，其中AGE为年龄字段，则表达式AGE NOT BETWEEN 18 AND 24等价于（） A: AGE＜=18 OR AGE＞=24 B: AGE＜=18 0R AGE＞24 C: AGE＜18 OR AGE＞=24 D: AGE＜18 0R AGE＞24
- 设有关系表S(NO,NAME,AGE),其中AGE为年龄字段,则表达式 A: E NOT BETWEEN 18 AND 24 等价于： B: AGE<=18 OR AGE>=24 C: AGE<=18 OR AGE>24 D: AGE<18 OR AGE>=24 E: AGE<18 OR AGE>24
- 若要求查找“年龄大于18岁学生的学生号和姓名”，正确的SQL语句是( )。 A: SELECT S#，SNAME FROM S WHERE AGE＞18 B: SELECT S#，SNAME FROM S WHERE AGE＞=18 C: SELECT S#，SNAME FROM S WHERE AGE＞’18’ D: SELECT S#，SNAME FROM S WHERE AGE＞=’18’
- 下面哪一个表达式能正确表示逻辑关系："age≥18 或age≤60"？ A: age>=18 || age B: age>=18 or age C: age>=18 | age D: age>=18 && age