请在 下方输入 要搜索的题目：
推荐参考答案 (
由 搜题小帮手 官方老师解答 )
答案：
以下文字与答案无关
提示：有些试题内容 显示不完整,文字错误 或者 答案显示错误等问题，这是由于我们在扫描录入过程中 机器识别错误导致,人工逐条矫正总有遗漏，所以恳请 广大网友理解。
相关试题
- 1.查询Student表中的所有非空Email信息，以下语句正确的是( )。 选项： A:SELECT Email FROM Student WHERE Email! = NULL B:SELECT EmaU FROM Student WHERE Email NOT IS NULL C:SELECT Email FROM Student WHERE Email<>NULL D:SELECT EmaH FROM Student WHERE Email IS NOT NULL
- 2.查询student表中的所有非空email信息，以下语句正确的是（ ）。 选项： A:Select email from student where email !=null B:Select email from student where email null C:Select email from student where email not is null D:Select email from student where email is not null
- 3.查询Student表中的所有非空Email信息，以下语句正确的是（ ）。选项： A:SELECT Email FROM Student WHERE Email ！= NULL；; B:SELECT Email FROM Student WHERE Email NOT IS NULL；; C:SELECT Email FROM Student WHERE Email <> NULL；; D:SELECT Email FROM Student WHERE Email IS NOT NULL；
- 4.查询student表中的所有非空email信息，以下语句正确的是 选项： A:select email from student where email !=null B:select email from student where email not is null C:select email from student where email null D:select email from student where email is not null
- 5.查询student表中的所有非空email信息, 以下语句正确的是（ ）。 选项： A:SELECT email FROM student WHERE email !=null B:SELECT email FROM student WHERE email not is null C:SELECT email FROM student WHERE email null D:SELECT email FROM student WHERE email is not null
- 6.查询student表中的所有非空email信息, 以下语句正确的是()。 选项： A:Select email from student where email !=null B: Select email from student where email not is null C:Select email from student where email <> null D:Select email from student where email is not null
- 7.下面哪一个语句,显示没有Email地址的教师姓名() 选项： A、Select name from teacher where email=NULL; B、Select name from teacher where email C、Select name from teacher where email is NULL; D、Select name from teacher where emailis not NULL;
- 8. 若想查询student表中name为空值的记录，则正确的SQL语句是 1分 选项： A:select * from student where name = null; B:select * from student where name link null; C:select * from student where name = 'null'; D:select * from student where name is null;
- 9. 查询所有非计算机系学生的信息，不正确的SQL语句是：（ ） 选项： A、 SELECT * FROM Student WHERE Sdept != 'CS'; B、 SELECT * FROM Student WHERE NOT Sdept = 'CS'; C、 SELECT * FROM Student WHERE Sdept IN ('MA', 'IS'); D、 SELECT * FROM Student WHERE NOT Sdept IN ('CS');
- 10.查询读者信息表中电话为NULL的读者信息。正确的SELECT语句是()。 选项：A、SELECT * FROM readerinfo WHERE telephone=null;B、SELECT * FROM readerinfo WHERE telephone==null;C、SELECT * FROM readerinfo WHERE telephone is null;D、SELECT * FROM readerinfo WHERE telephone='';
- 11.在学生表students中查询所有姓张的同学,可以使用语句( ) 选项： A、select * from student where name="张%"; B、select * from student where name like "张*"; C、select * from student where name like "%张"; D、select * from student where name like "张%";
- 12.使用教学（STC）数据库，与如下查询语句等价的是（ ）。 SELECT *FROM Student WHERE Sdept = 'CS' EXCEPT SELECT * FROM Student WHERE Sage <= 19; 选项： A、SELECT * FROM Student WHERE Sdept = 'CS' AND Sage > 19 B、SELECT * FROM Student WHERE Sdept = 'CS' AND Sage <= 19 C、SELECT * FROM Student WHERE Sdept = 'CS' OR Sage <= 19 D、SELECT * FROM Student WHERE Sdept = 'CS' OR Sage > 19
- 13.使用嵌套查询，得到在SC表中Grade高于90分的学生的基本信息，正确的SQL语句是( )。选项： A:Select * from Student where Sno = (Select Sno from SC where Grade >90); B:Select * from Student where Sno In (Select Sno from SC where Grade >90); C:Select * from Student where Sno Not In (Select Sno from SC where Grade >90); D:Select * from Student where Sno Exists (Select Sno from SC where Grade >90)
- 14.使用嵌套查询，得到在SC表中Grade高于90分的学生的基本信息，正确的SQL语句是( )。 选项： A、Select * from Student where Sno = (Select Sno from SC where Grade >90) B、Select * from Student where Sno In (Select Sno from SC where Grade >90) C、Select * from Student where Sno Not In (Select Sno from SC where Grade >90) D、Select * from Student where Sno Exists (Select Sno from SC where Grade >90)
- 15.下列查询语句，语法错误的是 A: SELECT id,name FROM student WHERE id = 4; B: SELECT id,name FROM student WHERE name = wusong; C: SELECT name,grade FROM student WHERE grade >= 80; D: SELECT * FROM student WHERE gender = '男';
- 16.从Student表检索姓周的学生，对应的SQL语句是( )。 选项： A、Select * From Student Where Sname like '周%' B、Select * From Student Where Sname like '%周' C、Select * From Student Where Sname like '_周' D、Select * From Student Where Sname like '周_'
- 17.使用嵌套查询，得到在SC表中Grade高于90分的学生的基本信息，正确的SQL语句是( )。 选项： A、Select * from Student where Sno = (Select Sno from SC where Grade >90) B、Select * from Student where Sno In (Select Sno from SC where Grade >90) C、Select * from Student where Sno Not In (Select Sno from SC where Grade >90) D、Select * from Student where Sno Exists (Select Sno from SC where Grade >90)
- 18.在sqlserver中，使用以下（ ）语句从表student中提取前10条记录。 选项：select * from student where rowcount=10|select TOP 10 * from student|select TOP of 10 * from student|select * from student where rowcount<=10
- 19.从Student表检索年龄小于21岁的男学生信息,最规范的SQL语句是( )。 选项： A、Select * From Student Where Ssex='男' Or Sage B、Select * From Student Where Ssex='男' And Sage<21 C、Select * From Student Where Ssex=男 And Sage D、Select * From Student Where Ssex='男' Or Sage<21
