When is lunch served A: From 11:30 to 2:40. B: From 11:30 to 2:30. C: From 12:30 to 2:40. D: From 12:30 to 2:30.

假设某表有三个字段：列名1、列名2、列名3，要查询该表的所有记录，写法正确的是： A: SELECT *列名1,列名2,列名3,…… FROM 表名; B: SELECT 列名1,列名2,列名3,…… FROM 表名; C: SELECT 列名1,列名2,列名3FROM 表名; D: SELECT *FROM 表名; E: SELECT 列名3,列名2,列名1FROM 表名; F: SELECT 列名1列名2 列名3FROM 表名; G: SELECT 列名2,列名1,列名3FROM 表名; H: H. SELECT 列名1;列名2;列名3FROM 表名; I: I. SELECT 列名1、列名2、列名3FROM 表名; J: J. SELECT {列名1,列名2,列名3,……}FROM 表名; K: K. SELECT {列名1,列名2,列名3}FROM 表名; L: L. SELECT 列名1,列名3,列名2FROM 表名;

From New York. (2) ______________?

假设数据表 “test1”中有 10 条记录，可获得最前面两条记录的命令为（ ） A: SELECT 2 * FROM test1 B: SELECT TOP 2 * FROM test1 C: SELECT PERCENT 2 * FROM test1 D: SELECT PERCENT 20 * FROM test1

查询“工资表”中职工编号末尾一位字符是“2”的正确命令是（ ） A: select * from 工资表 where left(编号,1)= "2" B: select * from 工资表 where right (编号,1)= "2" C: select * from 工资表 where substr(编号,1)= "2" D: select * from 工资表 where 编号$"2"

查询选修了数学课(课程号为2)的学生人数,可以使用的查询语句是:　 。 A: SELECT MAX(*) FROM SC WHERE Cno = 2; B: SELECT AVG(Sno) FROM SC WHERE Cno = 2; C: SELECT COUNT(*) FROM SC WHERE Cno = 2; D: SELECT COUNT(Sname) FROM SC WHERE Cno = 2;

(7) What is the date of Nathan Hale's reservation?A. A: From October 2nd for 3 nights. B: From October 3rd for 2 nights. C: From November 2nd for 3 nights. D: From November 3rd for 2 nights.

有一个名为“学生”的数据库表，若想查询姓“张”的学生的信息，应使用命令（） A: SELECT*FROM学生WHERELEFT(姓名，2)=“张” B: SELECT*FROM学生WHEREFIRST(姓名，2)=“张” C: SELECT*FROM学生WHEREHEAD(姓名，2)=张” D: SELECT*FROM学生WHERERIGHT(姓名，2)=“张”

Questions 22 ～ 25 are based on the following dialogue as to one person’s interview. What is the time schedule of the job A: 2 to 6 p. m. from Monday through Friday. B: 2 to 5 p. m. from Monday through Friday. C: 2 to 5 a. m. from Monday through Friday. D: 2 to 6 a. m. from Monday through Friday.

请选择下面正确的SQL语句( ) A: select * from 表名 order by 列名1 and order by 列名2 B: select * from 表名 order by 列名1,列名2 C: select * from 表名 where 列1=值1 and 列2=值2 D: select * from 表名 where 列1=值1 and 列1=值2