橙子j

摘要： txt文件 textFile=open(r'C:\Users\JChen46\Documents\info.txt') lines=textFile.readlines() textFile.close() for line in lines: username = line.split(',')[ 阅读全文

摘要： https://www.cnblogs.com/logon/p/3748020.html select * from table1 left join table2 on table1.id=table2.id 两个表dg1和dg2 外连接 left join,right join分别是left o 阅读全文