摘要： import pymysql user = input('username: ') pwd = input('password: ') conn = pymysql.connect(host='127.0.0.1',user='root',password='123',database='db666') cursor = conn.cursor() sql = "select * from us... 阅读全文

摘要： 表结构 -- 成绩大于60分-- select * from score where num >60-- 课程表中老师任课的个数是多少？-- SELECT * FROM course;-- SELECT teacher_id,count(cname)FROM course GROUP BY teac 阅读全文