Over the past few years, students taking my Perl/CGI course continued to ask me when I would be graduating from CGI
to PHP, and whether I would offer a course or write a PHP “by Example” book. I didn’t really take the idea of a book
seriously until
内含五套试卷、一个82页试卷题库、一个11页的复习总结,三份资料均有答案。
1. 设教学数据库中有三个基本表:
学生表S(SNO,SNAME,AGE,SEX),其属性分别表示学号、学生姓名、年龄、性别。课程表C(CNO,CNAME,TEACHER),其属性分别表示课程号、课程名、上课教师名。选修表SC(SNO,CNO,GRADE),其属性分别表示学号、课程号、成绩。
有如下SQL查询语句:
SELECT CNO
FROM C
WHERE CNO NOT IN
(SELECT CNO
FROM