mysql日期处在某两个时间段之间的between比较
where SYSDATE() between '2018-08-28 09:21:48' and '2018-08-28 09:25:48'
sysdate()等于2018-08-28 09:23:02
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where SYSDATE() between '2018-08-28 09:21:48' and '2018-08-28 09:25:48'
sysdate()等于2018-08-28 09:23:02