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  _____      ___      _____    _    _     ______  
 / ____||   / _ \\   / ____|| | || | ||  /_   _// 
/ //---`'  | / \ || / //---`' | || | ||  `-| |,-  
\ \\___    | \_/ || \ \\___   | \\_/ ||    | ||   
 \_____||   \___//   \_____||  \____//     |_||   
  `----`    `---`     `----`    `---`      `-`'

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發送短信 : Query transformation for exact cardinality computing