sql 按天然周,月，季度，年統計

參見兄弟的博客http://yuanyong.iteye.com/blog/451383 很不錯哦。呵呵 //按天然周統計 select to_char(date,'iw'),sum() from where group by to_char(date,'iw') //按天然月統計 select to_char(date,'mm'),sum() from where group by to_cha

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