按年彙總，統計：
select sum(mymoney) as totalmoney, count(*) as sheets from mytable group by date_format(col, '%y');
按月彙總，統計：
select sum(mymoney) as totalmoney, count(*) as sheets from mytable group by date_format(col, '%y-%m');
按季度彙總，統計：
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));
按小時：
select sum(mymoney) as totalmoney,count(*) as sheets from mytable group by date_format(col, '%y-%m-%d %h ');
查詢 本年度的資料:
select * from mytable where year(from_unixtime(my_time)) = year(curdate())
查詢資料附帶季度數:
select id, quarter(from_unixtime(my_time)) from mytable;
查詢 本季度的資料:
select * from mytable where quarter(from_unixtime(my_time)) = quarter(curdate());
本月統計:
select * from mytable where month(my_time1) = month(curdate()) and year(my_time2) = year(curdate())
本週統計:
select * from mytable where month(my_time1) = month(curdate()) and week(my_time2) = week(curdate())
n天內記錄:
where to_days(now())-to_days(時間字段)<=n
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