以下哪条SQL语句会返回一个错误?()
第1题:
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
第2题:
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
第3题:
有以下SQL语句:SELECT 订单号,签订日期,金额 FROM 订单,职员WHERE 订单.职员号=职员.职员号 AND 姓名=“李二”与如上语句功能相同的SQL语句是A) SELECT订单号,签订日期,金额FROM订单WHERE EXISTS(SELECT*FROM职员WHERE姓名=“李二”)B) SELECT订单号,签订日期,金额FROM订单WHEREEXISTS(SELECT*FROM职员WHERE职员号=订单.职员号AND姓名=“李二”:C) SELECT订单号,签订日期,金额FROM订单WHERE IN(SELECT职员号FROM职员WHERE姓名=“李二”)D) SELECT订单号,签订日期,金额FROM订单WHEREIN(SELECT职员号FROM职员WHERE职员号=订单.职员号AND姓名=“李二”)
第4题:
有如下SQL语句: SELECT姓名FROM学生表WHERE学号IN; (SELECT学号FROM成绩表WHERE成绩>90) 下列哪条命令与该SQL语句等价
A.SELECT姓名FROM学生表WHERE EXISTS; (SELECT学号FROM成绩表WHERE成绩>90)
B.SELECT姓名FROM学生表WHERE EXISTS; (SELECT学号FROM成绩表WHERE学号=学生表.学号AND成绩>90)
C.SELECT姓名FROM学生表WHERE学号EXISTS; (SELECT学号FROM成绩表WHERE学号=学生表.学号AND成绩>90)
D. SELECT姓名FROM学生表WHERE学号=; (SELECT学号FROM成绩表WHERE成绩>90)
第5题:
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
第6题:
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
第7题:
根据SQL标准,下面哪条语句与select min(age) from student等效?()
A select age from student where age >= min(age)
B select distinct age from student where age >= all min(age)
C select distinct a.age from student a where a.age<= any (select distinctb.age from student b)
D select distinct a.age from student a where a.age<= all (select distinct b.age from student b)
第8题:
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)
第9题:
利用SQL语句,检索仓库中至少有一名职工的仓库信息,正确的命令是______.
A.SELECT。FROM仓库表WHEREIN; (SELECT仓库号FROM职工表)
B.SELECT 2p FROM仓库表WHERENOTm; (SELECT仓库号FROM职工表)
C.SELECT::FROM仓库表WHERE仓库号EXISTS; (SELECT*FROM职工表WHERE仓库号:仓库表.仓库号)
D.SELECT*FROM仓库表WHEREEXISTS; (SEL。E(:T*FROM职工表WHERE仓库号:仓库表.仓库号)
第10题:
有SQL语句: SELECT DISTINCT 系号 FROM 教师 WHERE 工资>=; ALL(SELECT 工资 FROM 教师 WHERE 系号 =“02”) 与如上语句等价的SQL语句是
A.SELECT DISTINCT 系号 PROM 教师 WHERE 工资>=; (SELECT MAX(工资)FROM 教师 WHERE 系号=“02”)
B.SELECT DISTINCT 系号 FROM 教师 WHERE 工资=; (SELECT MIN(工资)FROM 教师 WHERE 系号=“02”)
C.SELECT DISTINCT 系号 FROM 教师 WHERE 工资>=; ANY(SELECT 工资 FROM 教师 WHERE 系号=“02”)
D.SELECT DISTINCT 系号 FROM 教师 WHERE 工资>=; SOME(SELECT 工资 FROM 教师 WHERE 系号=“02”)