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   _____     ___    __    __     ___     __   _   
  / ___//   / _ \\  \ \\ / //   / _ \\  | || | || 
  \___ \\  | / \ ||  \ \/ //   / //\ \\ | '--' || 
  /    //  | \_/ ||   \  //   |  ___  ||| .--. || 
 /____//    \___//     \//    |_||  |_|||_|| |_|| 
`-----`     `---`       `     `-`   `-` `-`  `-`

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發送短信 : Z-SKY: An Efficient Skyline Query Processing Framework Based on Z-Order