MySQL的TIMEDIFF和DATEDIFF
2015-10-06 09:18
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DATEDIFF
比较的是天数
select * from member where DATEDIFF(now(),start_time) = 0;今天 select * from member where DATEDIFF(now(),start_time) = 1; 昨天 select * from member where DATEDIFF(now(),start_time) < N; 最近几天
TIMEDIFF比较的是时间
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