目录前言：使用DATE或DATETIME字段使用TIMESTAMP字段注意进一步的优化查询指定日期前近一年的数据如果严格意义上的“前一年”order_date字段是时间戳类型这样写索引是否会失效总结前言：
we are doing quite some invoice generation, and so far it is based on some pretty awful word automation that is now in for a review with Word 2010.
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