php mysql分组后取分组中的第一条数据和最后一条数据 并且做统计这样的MYSQL怎么写呢

Question

需要按时间分组统计分组后的price总和 number总合 并要取出分组中的第一个price和最后一个price的值
找了好久找不到相应的方法希望各位能指导一下

Answer 1

时间分组，排序字段不清，姑且按price排序吧

select 
    mtime,sum(price),sum(number),
    substring_index(group_concat(price order by price),',',1) min_price,
    substring_index(group_concat(price order by price),',',-1) max_price
from table group by mtime;

Answer 2

select min(price) as min_price, max(price) as max_price from (select mtime, code, sum(price) as price, sum(number) as number from table_xx group by mtime order by mtime desc) data