How is MQTT applied to MQ queuing applications, or how do you understand them?

MQTT (: Message Queuing Telemetry Transport (message queuing Telemetry Transport Protocol)
message queuing (MQ): is used for asynchronous processing, application decoupling, traffic trimming, and so on.

so I have the following questions: 

 1:mqtt"message queuing" 
 2:MQ:
 rabbitmq,mqtt
 3:PHPer
 
 (;) 
    MQtask
    1
Mqtt mq
Mar.21,2022

Previous: The cPP subclass destructor was not called

Next: How does sublime format sql code?

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b2b80d-2afe7.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b2b80d-2afe7.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?