發送短信 : Multiple aggregations over data streams

 _    _     _____     ______   __   __    ______  
| \  / ||  |  ___||  /_   _//  \ \\/ //  /_   _// 
|  \/  ||  | ||__    `-| |,-    \ ` //     | ||   
| .  . ||  | ||__      | ||      | ||     _| ||   
|_|\/|_||  |_____||    |_||      |_||    /__//    
`-`  `-`   `-----`     `-`'      `-`'    `--`