1、datetime記錄的時(shí)間范圍較長(zhǎng)，1753-01-01到9999-12-31，可以精確到“秒”，它的長(zhǎng)度為8位，所占的空間較大。
datetime: Date and time data from January 1, 1753, to December 31, 9999, wITh an accuracy of three-hundredths of a second, or 3.33 milliseconds.
2、smalldatetime記錄的時(shí)間范圍較短，1900-01-01到2079-6-6，只能到精確到“分”，它的長(zhǎng)度為4位，所占的空間較小。
smalldatetime: Date and time data from January 1, 1900, through June 6, 2079, wITh an accuracy of one minute.
該文章在 2010/8/27 1:11:05 編輯過
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