Original text: https://blog.csdn.net/kenhins/article/details/52814333
按年汇总，统计：
select sum(mymoney) as totalmoney, count(*) as sheets from mytable group by date_format(col, '%Y');
按月汇总，统计：
select sum(mymoney) as totalmoney, count(*) as sheets from mytable group by date_format(col, '%Y-%m');
按季度汇总，统计：
select sum(mymoney) as totalmoney,count(*) as sheets from mytable group by concat(date_format(col, '%Y'),FLOOR((date_format(col, '%m')+2)/3));
select sum(mymoney) as totalmoney,count(*) as sheets from mytable group by concat(date_format(col, '%Y'),FLOOR((date_format(col, '%m')+2)/3));
按小时：
select sum(mymoney) as totalmoney,count(*) as sheets from mytable group by date_format(col, '%Y-%m-%d %H ');
查询 本年度的数据:
SELECT * FROM mytable WHERE year(FROM_UNIXTIME(my_time)) = year(curdate())
Query data with the number of quarters:
SELECT id, quarter(FROM_UNIXTIME(my_time)) FROM mytable;
query data for this quarter:
SELECT * FROM mytable WHERE quarter(FROM_UNIXTIME(my_time)) = quarter(curdate());
this month's statistics:
select * from mytable where month(my_time1) = month(curdate()) and year(my_time2) = year(curdate())
this week's statistics:
select * from mytable where month(my_time1) = month(curdate()) and week( my_time2) = week(curdate())
records within N days:
WHERE TO_DAYS(NOW())-TO_DAYS(time field)<=N