Mysql按小時，按日，按周，按月，按季度，按年分組統計數據

按小時：sql select from_unixtime(create_time,"%Y%m%d%H") as hours,count(id) as counts from table group by hours;函數 按日：spa select from_unixtime(create_time,"%Y-%m-%d") as days,count(id) as counts from tabl

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