SQL时间区间条件查询三种方法比较
最近遇到一个需要判断在某一时间段条件的查询，最开始用的between..and，后来想了想为啥不能用小于、大于，然后又想到用datediff函数先求出两个时间差再做正负判断。后来再了一次测试，数据比较少，大概500条数据，结果如下：
SELECT * FROM `userleveldetaillog` as u where u.`operatedate` >'2010-03-01' AND u.`operatedate`<'2010-04-01';415 rows fetched (31 ms)
SELECT * FROM `userleveldetaillog` as u where u.`operatedate` between '2010-03-01' AND '2010-04-01';415 rows fetched (47 ms)
SELECT * FROM `userleveldetaillog` as u where DATEDIFF(u.`operatedate`,'2010-03-01')>0 ANDDATEDIFF(u.`operatedate`,'2010-04-01')<0;415 rows fetched (62 ms)
结果在一定程度上说明：
还是土方法效率高。。。
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