替代MySQL查询在子查询总结

Question

我有一个具有以下字段的表：

date,amount,status 

和我有每天（引）同时返回的款额，以及只有查询给定状态的总和（SOLD）。

这很慢，我试图重写查询没有成功。

原来的查询是：

SELECT 
    YEAR(FROM_UNIXTIME(date)) as Year, 
    lpad(MONTH(FROM_UNIXTIME(date)), 2, 0) as Month, 
    lpad(DAY(FROM_UNIXTIME(date)), 2, 0) as Day, 
    (SELECT 
      sum(amount) 
     FROM 
      mytable 
     where 
      status = 'SOLD' 
       and YEAR(FROM_UNIXTIME(date)) = Year 
       and lpad(MONTH(FROM_UNIXTIME(date)), 2, 0) = Month 
       and lpad(DAY(FROM_UNIXTIME(date)), 2, 0) = Day) as Sold, 
    (SELECT 
      sum(amount) 
     FROM 
      mytable 
     WHERE 
      YEAR(FROM_UNIXTIME(date)) = Year 
       and lpad(MONTH(FROM_UNIXTIME(date)), 2, 0) = Month 
       and lpad(DAY(FROM_UNIXTIME(date)), 2, 0) = Day) as Quoted 
FROM 
    mytable 
group by Year , Month , Day 

输出看起来像这样（年月日SUM）：

2013  12   01   3442.00 

有没有更好的方式来写这个所以它立即执行？表中的记录少于10,000条。

Answer 1

可以至少避免子查询

SELECT 
    YEAR(FROM_UNIXTIME(date)) as Year, 
    lpad(MONTH(FROM_UNIXTIME(date)), 2, 0) as Month, 
    lpad(DAY(FROM_UNIXTIME(date)), 2, 0) as Day, 
    SUM(case 
     when status = 'SOLD' then amount 
     else 0 end) Sold, 
    sum(amount) as Quoted 
from 
    mytable 
GROUP BY Year , Month , Day