如何在SQL查询中按组计算行数

Question

我有一个SQL查询，它返回包含报价类型和客户信息的数据。有4种类型的报价（Open，Dead，Requote，Project）。我希望能够为每个客户计算每种类型。并且还计算总数。我还没有找到实现这个目标的方法。

最终，我希望这可以在SSRS报告中进行衡量，以便我们可以判断有多少报价（百分比）最终变成了项目。

我的搜索中没有找到任何可行的内容。提前感谢任何建议。

Answer 1

使用CTE＆＃39;

 WITH quoteTotal as (
      Select customer, count(*) as customer_total
      from customer
      group by customer
 ),
 typeQuote as (
      Select customer, quote_type, count(*) as quote_total
      from customer
      group by customer, quote_type
 )
 SELECT T.customer, T.quote_type, T.quote_total, Q.customer_total
 FROM typeQuote T
 INNER JOIN quoteTotal Q
    ON T.customer = Q.customer

我认为使用窗口函数很容易。

SELECT DISTINCT 
       customer, 
       quote_type,
       COUNT(*) OVER (partition by customer, quote_type order by customer) as type_total,
       COUNT(*) OVER (partition by customer order by customer) as customer_total
FROM customers

Answer 2

对于以下数据：

我已经执行了以下查询

select  CustomerEntityId,QuoteType,
(select count(QuoteType) from Customers c
    where c.QuoteType=Customers.QuoteType
        and c.CustomerEntityId=customers.CustomerEntityId
    group by CustomerEntityId,QuoteType) as QuoteTypeTotal,
(select count(*) from Customers c1 
    where c1.CustomerEntityId=Customers.CustomerEntityId 
    group by CustomerEntityId) as CustomerTotal
from Customers
Group By CustomerEntityId,QuoteType
Order By CustomerEntityId

结果如下：

我希望它有所帮助。