单选题下列正确的SQL语句是（）。A SELECT*HAVING userB SELECT*WHERE userC SELECT*FROM userD SELECT user INTO*

标准的SQL基本查询语句的格式是( )。

A．SELECT...FROM...WHERE

B．SELECT...WHERE...FROM

C．SELECT...WHERE...GROUP BY

D．SELECT...FROM...ORDER BY

对由SELECT—FROM—WHERE—GROUP—ORDER组成的SQL语句，其在被DBMS处理时，各子句的执序次序(43)。

A．SELECT—FROM—GROUP—WHERE—ORDER

B．FROM—SELECT—WHERE—GROUP—ORDER

C．FROM—WHERE—GROUP—SELECT—ORDER

D．SELECT—FROM—WHERE—GROUP—ORDER

SQL语句：

SELECT*FROM班级WHERE班级号NOT IN;

(SELECT班级号FROM学生)

该语句等价于：

SELECT*FROM班级WHERE NOT______;

(SELECT*FROM学生WHERE班级号=班级.班级号)

有SQL语句：SELECT * FROM 教师 WHERE NOT(工资>3000 OR 工资<2000)与如下语句等价的SQL语句是A）SELECT*FROM 教师 WHERE 工资 BETWEEN 2000 AND 3000B) SELECT*FROM 教师 WHERE 工资>2000 AND 工资<3000C）SELECT*FROM 教师 WHERE 工资>2000 OR 工资<3000D) SELECT*FROM 教师 WHERE 工资<=2000 AND 工资>3000

根据SQL标准，要查询表student中所有年龄age小于所有学生的平均年龄的记录，下面哪条语句适用?()

A select * from student where age< avg(age)

B select * from student having age< avg(age)

C select * from student a where a.age< (select avg(b.age) from student b)

D select * from student a where (select avg(b.age) from student b ) >= a.age

有如下SQL-SELECT语句

SELECT * FROM HH WHERE 单价 BETWEEN 10.6 AND 13.4

与该语句等价的是

A．SELECT * FROM HH WHERE 单价<=13.4 AND 单价>=10.6

B．SELECT * FROM HH WHERE 单价<13.4 AND 单价>10.6

C．SELECT * FROM HH WHERE 单价>=13.4 AND 单价<=10.6

D．SELECT * FROM HH WHERE 单价>13.4 AND 单价<10.6

A.Select*from user

B.update user set username=’zhangsan’where id=’2’

C.Delete*from user

D.insert into user values(1,’zhang’,’pass’);

有SQL语句： SELECT*FROM教师WHERENOT(工资＞30000R工资＜2000)与如上语句等价的SQL语句是

A．SELECT*FROM 教师 WHERE 工资 BETWEEN 2000 AND 3000

B．SELECT*FROM 教师 WHERE 工资＞2000 AND工资＜3000

C．SELECT*FROM 教师 WHERE 工资＞2000 OR工资＜3000

D．SELECT*FROM 教师 WHERE 工资＜=2000 AND工资＞3000

要从选课表(学号、课程号、成绩)中查询选修了三门课程以上的学生学号，应使用的SELECT-SQL语句是

A．SELECT学号FROM选课表WHERE COUNT(*)＞=3

B．SELECT学号FROM选课表HAVING COUNT(*)＞=3

C．SELECT学号FROM选课表GROUP BY学号HAVING COUNT(*)＞=3

D．SELECT学号FROM选课表GROUP BY学号WHERE COUNT(*)＞=3

有如下SQL SELECT 语句SELECT * FROM stock WHERE 单价 BETWEEN 12.76 AND 15.20与该语句等价的是A) SELECT * FROM stock WHERE 单价<=15.20.AND.单价>=12.76B) SELECT * FROM stock WHERE 单价<15.20.AND.单价>12.76C) SELECT * FROM stock WHERE 单价>=15.20.AND.单价<=12.76D) SELECT * FROM stock WHERE 单价>15.20.AND.单价<12.76