What is the "n" Sid error returned by the mysql-Mysql command ??

System environment: phpstudy2013 any mysql command will return a line of information: & quot; n & quot; Sid: S-1-5-21-740959277-904983777-1984901902-1000, MySQLdump command will also return and output this information, as a result, the dump file adds this line of useless information without reason. Why is this? What does that mean? How can we eliminate this strange line of information ?! IMG (img.ask.csdn.netupload201510111444578746_594335.gif mysql)

System environment: phpstudy 2013
All mysql commands will return a line of information: "n" Sid: S-1-5-21-740959277-904983777-1984901902-1000, MySQL dump command will also return and output this information, as a result, the dump file adds this line of useless information without reason. Why is this? What does that mean? How can we eliminate this strange line of information?