mysql - MySQL查询特定年份和地区

Question

我尝试进行查询，我可以在数据库中看到 2007 年和 2008 年美国和世界其他地区的销售净额以及所有小计和总计。（值得一提的是，美国和 World 是区域，已在数据库中编码）

我的查询：

SELECT country regionname, sum(custamot)Totsales 
FROM( select o.customerid, sum(netamount) custamot, c.country
FROM orders o join customers c
on o.customerid = c.customerid
where country like 'US' 
group by c.customerid ) iv;

这个查询只是告诉我美国的总销售额（你可以看到没有一年）。我尝试了没有该部分的查询：

where country like 'US' 

但结果是一样的。我找不到向我显示特定年份的美国和世界的查询...

任何想法都会有所帮助

谢天谢地，乔普

Answer 1

您需要group by在外面添加一个子句：

SELECT country as regionname, sum(custamot) as Totsales 
FROM (select o.customerid, sum(netamount) custamot, c.country
      FROM orders o join
           customers c
           on o.customerid = c.customerid
      group by c.customerid
     ) iv
group by country;

实际上，您不需要子查询：

select country as regionname, sum(netamount) as Totsales
FROM orders o join
     customers c
     on o.customerid = c.customerid
group by country;

要在同一查询中获取总数，请使用with rollup：

select country as regionname, sum(netamount) as Totsales
FROM orders o join
     customers c
     on o.customerid = c.customerid
group by country with rollup;

最后，要添加年份，要么使用where子句，要么试试这个：

select year(orderdate) as yr, country as regionname, sum(netamount) as Totsales
FROM orders o join
     customers c
     on o.customerid = c.customerid
group by year(orderdate), country with rollup;

并将 US 和 ROW 分开：

select year(orderdate) as yr,
       (case when country = 'US' then 'US' else 'ROW' end) as region,
       sum(netamount) as TotSales
FROM orders o join
     customers c
     on o.customerid = c.customerid
group by year(orderdate),  (case when country = 'US' then 'US' else 'ROW' end) with rollup;

Answer 2

像这样的东西：

SELECT country as regionname, sum(custamot)Totsales 
FROM( select o.customerid, sum(netamount) custamot, c.country
      FROM orders o join customers c
       on o.customerid = c.customerid
      where left(my_date,4) between 2007 and 2008
      group by c.customerid ) iv
group by country

萨卢多斯 ;)

Answer 3

要获得某一年的结果，假设您有一个日期字段，

where YourDateField >= {d '2007-01-01'}
and YourDateField < {d '2008-01-01'}