查询住址为 ‘北京’,上海的学生姓名,电话,住址
SELECT studentname,phone,addres FROM student WHERE addres='北京' or‘上海’
查询名称中含有‘数据库’字样科目信息
SELECT * FROM subject WHERE subjectname like ‘%数据库%’
查询电话中以‘138’开头的学生信息
SELECT * FROM student WHERE phone like ‘138%’
查询姓姜的但明的学生信息
SELECT * FROM student WHERE studentname like ‘姜_’
查询某1994-07-15到1998-09-09出生日期之间学生信息
SELECT * FROM student WHERE borndate between ‘1994-07-15’ and ‘1998-09-09’
限定学号为2号的学生的某些科目的考试成绩信息
SELECT *FROM result WHERE resultno=2 and subjectid in(1,2,3)