查詢某個 TIMESTAMP 欄位在一天內的資料
SELECT * FROM table WHERE DATE_SUB(NOW(), INTERVAL 1 DAY) > timeDATE_SUB 的參考文獻
http://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html#function_date-add
TIMESTAMP 的幾種 Default 值:
CURRENT_TIMESTAMP
CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP
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