oracle 按天天、周、月、季度、年統計

//按天統計,createtime爲數據庫的date類型，格式爲：yyyy-MM-dd hh24:mi:ss select trunc(createtime,'DD') as 日期,count(主鍵) as 數量 from tablename group by trunc(createtime, 'DD') order by trunc(createtime, 'DD') e.g. sele

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