Mysql 时间汇总

原符号       <        <=      >       >=       &        '        "
替换符号    <    <=   >    >=   &   '  "

  select  now();
  set global time_zone = '+8:00'; ##修改mysql全局时区为北京时间，即我们所在的东8区
  set time_zone = '+8:00'; ##修改当前会话时区
  flush privileges; #立即生效

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())

查询数据附带季度数:
SELECT id, quarter(FROM_UNIXTIME(my_time)) FROM mytable;

查询 本季度的数据:
SELECT * FROM mytable WHERE quarter(FROM_UNIXTIME(my_time)) = quarter(curdate());

本月统计:
select * from mytable where month(my_time1) = month(curdate()) and year(my_time2) = year(curdate())

本周统计:
select * from mytable where month(my_time1) = month(curdate()) and week(my_time2) = week(curdate())

N天内记录:
WHERE TO_DAYS(NOW())-TO_DAYS(时间字段)<=N