The connection between two networks from an intemet is handled by a machine known as a() A.bridgeB.serverC.routerD.switch
The connection between two networks from an intemet is handled by a machine known as a()
A.bridge
B.server
C.router
D.switch
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The ability to tolerate pain varies ______ person ______ person. (A) between … and(B) both … and(C) from … to(D) of … to
有下列SQLSELECT语句:SELECT*FROM 工资表 WHERE 基本工资=1000下列与该语句 有下列SQLSELECT语句：SELECT*FROM 工资表 WHERE 基本工资＜=3000 AND 基本工资＞=1000下列与该语句等价的是( )。A．SELECT*FROM工资表WHERE基本工资BETWEEN 1000 AND 3000B．SELECT*FROM工资表WHERE基本工资BETWEEN 3000 AND 1000C．SELECT*FROM工资表WHERE基本工资FROM 1000 INTO 3000D．SELECT*FROM工资表WHERE基本工资FROM 3000 INTO 1000
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
～(35)题使用如下数据表：学生．DBF：学号(C，8)姓名(C，6)，性别(C，2)选课．DBF：学号(C，8)，课程号(C，3)，成绩(N，3)从“选课”表中检索成绩大于等于60并且小于90的记录信息，正确的SQL命令是( )。A．SELECT*FROM选课WHERE成绩BETWEEN 60 AND 89B．SELECT*FROM选课WHERE成绩BETWEEN 60 T0 89C．SELECT*FROM选课WHERE成绩BETWEEN 60 AND 90D．SELECT*FROM选课WHERE成绩BETWEEN 60 TO 90
根据以下资料，回答下列各题：使用如下数据表： 学生．DBF：学号(C，8)，姓名(C，6)，性别(C，2) 选课．DBF：学号(C，8)，课程号(C，3)，成绩(N，3) 从“选课”表中检索成绩大于等于60并且小于90的记录信息，正确的SQL命令是（ ）。A.SELECT*FROM选课WHERE成绩BETWEEN 60 AND 89B.SELECT*FROM选课WHERE成绩BETWEEN 60 TO 89C.SELECT*FROM选课WHERE成绩BETWEEN 60 AND 90D.SELECT*FROM选课WHERE成绩BETWEEN 60 TO 90
有SQL语句 SELECT * FROM 教师 WHERE NOT(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 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
有SQL语句： SELECT * FROM 教师 WHERE NOT (工资＞3000 OR 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 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
有下列SQL SELECT语句:SELECT*FROM 工资表 WHERE 基本工资=1000下列与该语 有下列SQL SELECT语句： SELECT*FROM 工资表 WHERE 基本工资＜=3000 AND 基本工资＞=1000 下列与该语句等价的是( )。A．SELECT*FROM 工资表 WHERE 基本工资 BETWEEN 1000 AND 3000B．SELECT*FROM 工资表 WHERE 基本工资 BETWEEN 3000 AND 1000C．SELECT*FROM 工资表 WHERE 基本工资 FROM 1000 INTO 3000D．SELECT*FROM 工资表 WHERE 基本工资 FROM 3000 INTO 1000
有SQL语句：SELECT * FROM教师WHERE NOT（工资3000 OR 工资2000）与如上语句等价的SQL语句是A．SELECT*FROM 教师 HWERE 工资 BETWEEN 2000 AND 3000B．SELECT*FROM 教师 HWERE 工资 2000 AND 工资3000C．SELECT*FROM 教师 HWERE 工资2000 OR 工资3000D．SELECT*FROM 教师 HWERE 工资=2000 AND 工资=3000
查询选课表中信息正确的是（）。A．select 学号,课程号 case when 成绩 between 60 and 100 then '通过' else then '未过' end 通过否 from 选课表B．select 学号,课程号, case when 成绩 between 60 and 100 then '通过' else '未过' as 通过否 from 选课表C．select 学号,课程号 from 选课表 case when 成绩 between 60 and 100 then '通过' else '未过' end 通过否D．select 学号,课程号, case when 成绩 between 60 and 100 then '通过' else '未过' end 通过否 from 选课表