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每年 select to_char(createtime, 'YYYY') 年, count(*) from table group by to_char(createtime, 'YYYY'); 每季度 select to_char(createtime, 'q') 年, count(*) from table group by to_char(createtime, 'q'); 每月 select to_char(createtime, 'YYYY') 年, to_char(createtime, 'mm') 月, count(*) from table group by to_char(createtime, 'YYYY'), to_char(createtime, 'mm'); 每日 select to_char(createtime, 'YYYY') 年,to_char(createtime, 'mm') 月,to_char(createtime, 'dd') 日, count(*) from table group by to_char(createtime, 'YYYY'), to_char(createtime, 'mm'),to_char(createtime, 'dd'); 其中createtime为date类型，如果为varchar先要转换为date类型
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