Question

我尝试进行查询，在那里我可以看到该网站的销售净额 2007年和2008年美国和世界其他地区的数据库以及所有小计以及总数。（值得一提的是，美国和世界是已经在数据库中编码的区域）

我的查询到目前为止：

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;

这个查询告诉我美国的totsales（没有一年你可以看到）。我尝试了没有部分的查询：

where country like 'US'

但结果是一样的。我无法找到一个查询，其中显示了特定年份的美国和世界......

任何想法都会有所帮助

感激， JOP

Answer 1

您需要在外部添加group by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，请使用where子句或尝试此操作：

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;

分开美国和ROW：

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

这样的事情：

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

Saludos;）

Answer 3

要获得特定年份的结果，假设您有一个日期字段，

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

MySQL查询特定年份和地区

3 个答案: