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             ___      _  _     ______   _    _   
    ___     / _ \\   | \| ||  /_   _// | |  | || 
   /   ||  | / \ ||  |  ' ||   -| ||-  | |/\| || 
  | [] ||  | \_/ ||  | .  ||   _| ||_  |  /\  || 
   \__ ||   \___//   |_|\_||  /_____// |_// \_|| 
    -|_||   `---`    `-` -`   `-----`  `-`   `-` 
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發送短信 : Query transformation for exact cardinality computing