查询选课门数大于3门的同学学号,姓名, 选课门数Select ______________from student s, scwhere s.sno=sc.sno group by __________having _____________ A: sno, sname, count(*) ; sno, sname; count(*)>3 B: sno, sname, count(*) ; sno; count(*)>3 C: sno, sname, count(cno) ; sno; count(cno)>3 D: sno, sname, count(sno) ; sno; count(sno)>3
查询选课门数大于3门的同学学号,姓名, 选课门数Select ______________from student s, scwhere s.sno=sc.sno group by __________having _____________ A: sno, sname, count(*) ; sno, sname; count(*)>3 B: sno, sname, count(*) ; sno; count(*)>3 C: sno, sname, count(cno) ; sno; count(cno)>3 D: sno, sname, count(sno) ; sno; count(sno)>3
count=5while(count>1): print(count,end="") count-=1输出是什么 A: 1 2 3 4 5 B: 2 3 4 5 C: 5 4 3 2 1 D: 5 4 3 2
count=5while(count>1): print(count,end="") count-=1输出是什么 A: 1 2 3 4 5 B: 2 3 4 5 C: 5 4 3 2 1 D: 5 4 3 2
查询最少选修了3门课程的学生学号和姓名,正确的SQL语句是()。 A: SELECT 学号,姓名,COUNT(*) FROM 选课成绩 WHERE COUNT(*)>=3 GROUP BY 学号 B: SELECT 学号,姓名,COUNT(*) FROM选课成绩 WHERE COUNT(*)>=3 GROUP BY学号,姓名 C: SELECT 学号,姓名,COUNT(*) FROM 选课成绩 GROUP BY学号HAVING COUNT(*)>=3 D: SELECT 学号,姓名,COUNT(*) FROM 选课成绩 GROUP BY学号,姓名 HAVING COUNT(*)>=3
查询最少选修了3门课程的学生学号和姓名,正确的SQL语句是()。 A: SELECT 学号,姓名,COUNT(*) FROM 选课成绩 WHERE COUNT(*)>=3 GROUP BY 学号 B: SELECT 学号,姓名,COUNT(*) FROM选课成绩 WHERE COUNT(*)>=3 GROUP BY学号,姓名 C: SELECT 学号,姓名,COUNT(*) FROM 选课成绩 GROUP BY学号HAVING COUNT(*)>=3 D: SELECT 学号,姓名,COUNT(*) FROM 选课成绩 GROUP BY学号,姓名 HAVING COUNT(*)>=3
写出下列程序的输出结果( )<?php $count =5; function get_count(){ static $count =0; return $count++;} echo $count; ++$count; echo get_count(); echo get_count();?>
写出下列程序的输出结果( )<?php $count =5; function get_count(){ static $count =0; return $count++;} echo $count; ++$count; echo get_count(); echo get_count();?>
以下( )语句可查询选修了三门以上成绩在80分以上课程的学生学号。 A: select sno from scwhere grade>80group by snohaving count(cno)>3 B: select sno from scwhere grade>80group by snohaving count(*)>3 C: select sno from scwhere grade>80 and count(*)>3group by sno D: select sno from scwhere grade>80group by snohaving count(sno)>3
以下( )语句可查询选修了三门以上成绩在80分以上课程的学生学号。 A: select sno from scwhere grade>80group by snohaving count(cno)>3 B: select sno from scwhere grade>80group by snohaving count(*)>3 C: select sno from scwhere grade>80 and count(*)>3group by sno D: select sno from scwhere grade>80group by snohaving count(sno)>3
在Excel工作表中,要计算A1:C8区域中值大于等于60的单元格个数,应使用的公式是( )。 A: =COUNT(A1:C8,">=60") B: =COUNTIF(A1:C8,>=60) C: =COUNTIF(A1:C8,">=60") D: =COUNT(A1:C8,>=60)
在Excel工作表中,要计算A1:C8区域中值大于等于60的单元格个数,应使用的公式是( )。 A: =COUNT(A1:C8,">=60") B: =COUNTIF(A1:C8,>=60) C: =COUNTIF(A1:C8,">=60") D: =COUNT(A1:C8,>=60)
在Excel工作表中,要计算A1:C8区域中值大于等于60的单元格个数,应使用的公式是_____。 A: =COUNT(A1:C8, ">=60") B: =COUNTIF(A1:C8, >=60) C: =COUNT(A1:C8, >=60) D: =COUNTIF(A1:C8, ">=60")
在Excel工作表中,要计算A1:C8区域中值大于等于60的单元格个数,应使用的公式是_____。 A: =COUNT(A1:C8, ">=60") B: =COUNTIF(A1:C8, >=60) C: =COUNT(A1:C8, >=60) D: =COUNTIF(A1:C8, ">=60")
有订单表orders, ,包含用户信息userid, 产品信息productid,以下能够返回至少被订购过两次的productid的SQL语句是() A: select productid from orderswhere count(productid)>1; B: select productid from orderswhere max(productid)>1; C: select productid from orderswhere having count(productid)>1group by productid; D: select productid from ordersgroup by productidhaving count(productid)>1;
有订单表orders, ,包含用户信息userid, 产品信息productid,以下能够返回至少被订购过两次的productid的SQL语句是() A: select productid from orderswhere count(productid)>1; B: select productid from orderswhere max(productid)>1; C: select productid from orderswhere having count(productid)>1group by productid; D: select productid from ordersgroup by productidhaving count(productid)>1;
以下PHP程序的输出结果是()。<?php $arr = array(-8=>4,-7=>5,6,9=>28); echo count($arr); ?> A: 4 B: 9 C: 10 D: 2
以下PHP程序的输出结果是()。<?php $arr = array(-8=>4,-7=>5,6,9=>28); echo count($arr); ?> A: 4 B: 9 C: 10 D: 2
有一个“成绩”表,包含学号、课程号、成绩三个字段。要求查询2科以上不及格(包括2科)学生信息。显示学号、不及格课程数。对应的SQL语句为( ) A: select 学号,count(*) as 不及格课程数 from 学生 having 成绩<60 group by 学号 where count(*)>=2 B: select 学号,count(*) as 不及格课程数 from 学生 where 成绩<60 group by 学号 where count(*)>=2 C: select 学号,count(*) as 不及格课程数 from 学生 where 成绩<60 group by 学号 having 不及格课程数>=2 D: select 学号,count(*) as 不及格课程数 from 学生 where 成绩<60 group by 学号 having count(*)>=2
有一个“成绩”表,包含学号、课程号、成绩三个字段。要求查询2科以上不及格(包括2科)学生信息。显示学号、不及格课程数。对应的SQL语句为( ) A: select 学号,count(*) as 不及格课程数 from 学生 having 成绩<60 group by 学号 where count(*)>=2 B: select 学号,count(*) as 不及格课程数 from 学生 where 成绩<60 group by 学号 where count(*)>=2 C: select 学号,count(*) as 不及格课程数 from 学生 where 成绩<60 group by 学号 having 不及格课程数>=2 D: select 学号,count(*) as 不及格课程数 from 学生 where 成绩<60 group by 学号 having count(*)>=2