A.select *from sc where score>60or course=’math’;B.select sname from sc where score>60and course=’math’;C.select course from sc where score>60or sname=’math’;D.select sname from sc where score in (60,100)and course=’math’;
单项选择题下列中间件中,哪个中间件的默认端口号不是80()
A.ApacheB.IISC.TomcatD.Nginx
单项选择题下列哪一种函数能够计算分组后结果集的函数()
A.COUNT()B.MAX()C.AVG()D.SUM()
单项选择题下列哪一项不是MySQL针对数值数据的函数()
A.round()B.avg()C.sum()D.version()
单项选择题为确保数据库安全,在缺省安装完MySQL数据库后,建议将以下哪个数据库进行删除()
A.MySQLB.information_schemaC.performance_schemaD.test
单项选择题查询student数据表中sid和name两个字段的数据内容()
A.select sid student into student;B.select sid,name where student;C.select from tb where column is sid name;D.select sid,name from student;