The teachers have work hard ,but we are also aware of the tremendous effort made by the students in their part.() 此题为判断题(对,错)。

The teachers have work hard ,but we are also aware of the tremendous effort made by the students in their part.()

此题为判断题(对,错)。


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假定学生Students和教师Teachers关系模式如下所示: Students(学号,姓名,性别,类别,身份证号) Teachers(教师号,姓名,性别,身份证号,工资) a.查询在读研究生教师的平均工资、最高与最低工资之间差值的SQL语句如下: SELECT ( ) FROM Students,Teachers WHERE( );b.查询既是研究生,又是女性,且工资大于等于3500元的教师的身份证号和姓名的SQL语句如下: (SELECT 身份证号,姓名 FROM Students WHERE( )) ( ) (SELECT身份证号,姓名 FROM Teachers WHERE( ))A.AVG(工资) AS 平均工资,MAX(工资)-MIN(工资) AS差值 B.平均工资 AS AVG(工资),差值 AS MAX(工资)-MIN(工资) C.AVG(工资) ANY 平均工资,MAX(工资)-MIN(工资) ANY 差值 D.平均工资 ANY AVG(工资),差值 ANY MAX(工资)-MIN(工资) A.Students.身份证号 = Teachers.身份证号 B.Students.类别 =研究生 C.Students.身份证号 = Teachers.身份证号 AND Students.类别 =研究生 D.Students.身份证号 = Teachers.身份证号 OR Students.类别 =研究生 A.工资=3500 B.工资=3500 C.性别=女 AND 类别=研究生 D.性别=女 AND 类别=研究生 A.EXPERT B.INTERSECT C.UNION D.UNIONALL A.工资=3500 B.工资=3500 C.性别=女 AND 类别=研究生 D.性别=女 AND 类别=研究生

假定学生Students和教师Teachers关系模式如下所示:Students(学号,姓名,性别,类别,身份证号)Teachers(教师号,姓名,性别,身份证号,工资)a.查询在读研究生教师的平均工资、最高与最低工资之间差值的SQL语句如下:SELECT( )FROM Students,TeachersWHERE(请作答此空);b.查询既是研究生,又是女性,且工资大于等于3500元的教师的身份证号和姓名的SQL语句如下:(SELECT身份证号,姓名FROM StudentsWHERE( ))( )(SELECT身份证号,姓名FROM TeachersWHERE( ));A.Students.身份证号=Teachers.身份证号B.Students.类别='研究生'C.Students.身份证号=Teachers.身份证号AND Students.类别='研究生'D.Students.身份证号=Teachers.身份证号OR Students.类别='研究生'

假定学生Students和教师Teachers关系模式如下所示:Students(学号,姓名,性别,类别,身份证号)Teachers(教师号,姓名,性别,身份证号,工资)a.查询在读研究生教师的平均工资、最高与最低工资之间差值的SQL语句如下:SELECT( )FROM Students,TeachersWHERE( );b.查询既是研究生,又是女性,且工资大于等于3500元的教师的身份证号和姓名的SQL语句如下:(SELECT身份证号,姓名FROM StudentsWHERE( ))(请作答此空)(SELECT身份证号,姓名FROM TeachersWHERE( ));A.EXCEPTB.INTERSECTC.UNIOND.UNIONALL

【判断题】英音里字母r在元音后时念为卷舌音, 如shared, hard, work。A.Y.是B.N.否