如何通过分组改进查询？

Question

如何为＆＃34; retirements＆＃34;添加分组？表格由＆＃34; id_type＆＃34;领域，而不只是每个人？

select name,
  sum(retirements.price_per_product) 
from retirements 
join type_of_products top on retirements.id_product = top.id
where (date between '1998-11-01' and '1998-11-14')
group by name;

不要求助于每种类型的汇总功能吗？它太粗鲁了。

Answer 1

有两种不同的方法可以实现这一目标。

1. You may use a sub-query but it is expensive in terms of performance.
2. You may utilize the #temp table and join it in later part. A downside is it is 

编码时间更长，但从长远来看，性能也很好。