如何在 SQL 查询中按组计算行数

Question

我有一个 SQL 查询 returns 数据，其中包括报价类型和客户信息。有 4 种类型的报价（未结、无效、重新报价、项目）。我希望能够为每个客户计算每种类型。还要数总数。我还没有找到实现这个的方法。

最终我希望将其纳入 SSRS 报告的衡量标准，以便我们可以判断有多少报价（百分比）最终变成了一个项目。

我在搜索中没有找到任何有用的东西。在此先感谢您的任何建议。

Answer 1

使用 CTE

 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 window 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

如下数据：

我已经执行了下面的查询

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：

希望对您有所帮助。

如何在 SQL 查询中按组计算行数

How to count rows by group in a SQL query

sql

sql-server-2012

ssrs-2012