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