摘要:
要求:将score表,student表,class表连接起来,并且筛选出其中的sid,student_id,sname,course_id,cname,number SELECT score.sid, score.student_id, student.sname, score.course_id, 阅读全文
摘要:
<!doctype html><html><head><meta charset="utf-8"><title>company</title><style type="text/css">body,td,th { font-style: normal; font-weight: 100; font- 阅读全文