单选题

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 (请作答此空)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

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)

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