TSQL Row_Number

Question

这个问题已经被类似的介绍过了，但是我很挣扎。

我需要找到根据客户的购买模式前N个销售..

理想这需要由客户前N个由个月的时间由一年，但现在我只是在整体看前N D B。

我的查询是这样的：

-- QUERY TO SHOW TOP 2 CUSTOMER INVOICES BY CUSTOMER BY MONTH 

SELECT 
    bill_to_code, 
    INVOICE_NUMBER, 
    SUM(INVOICE_AMOUNT_CORP) AS 'SALES', 
    ROW_NUMBER() OVER (PARTITION BY bill_to_code ORDER BY SUM(INVOICE_AMOUNT_CORP) DESC) AS 'Row' 
FROM 
    FACT_OM_INVOICE 
    JOIN dim_customer_bill_to ON FACT_OM_INVOICE.dim_customer_bill_to_key = dim_customer_bill_to.dim_customer_bill_to_key 
--WHERE 
-- 'ROW' < 2 
GROUP BY 
    invoice_number, 
    Dim_customer_bill_to.bill_to_code 

我无法理解给定的限制行= < N.

请帮忙解决方案。

Answer 1

试试这个。

-- QUERY TO SHOW TOP 2 CUSTOMER INVOICES BY CUSTOMER BY MONTH 
;WITH Top2Customers 
AS 
(
SELECT 
    bill_to_code, 
    INVOICE_NUMBER, 
    SUM(INVOICE_AMOUNT_CORP) AS 'SALES', 
    ROW_NUMBER() OVER (PARTITION BY bill_to_code ORDER BY SUM(INVOICE_AMOUNT_CORP) DESC) 
    AS 'RowNumber' 
FROM 
    FACT_OM_INVOICE 
    JOIN dim_customer_bill_to ON FACT_OM_INVOICE.dim_customer_bill_to_key = dim_customer_bill_to.dim_customer_bill_to_key 
GROUP BY 
    invoice_number, 
    Dim_customer_bill_to.bill_to_code 
) 
SELECT * FROM Top2Customers WHERE RowNumber < 3 

Answer 2

你必须换你选择到另一个使用（）由ROW_NUMBER产生的价值

select * from (
SELECT 
    bill_to_code, 
    INVOICE_NUMBER, 
    SUM(INVOICE_AMOUNT_CORP) AS SALES, 
    ROW_NUMBER() OVER (PARTITION BY bill_to_code ORDER BY SUM(INVOICE_AMOUNT_CORP) DESC) AS RowNo 
FROM 
    FACT_OM_INVOICE 
    JOIN dim_customer_bill_to ON FACT_OM_INVOICE.dim_customer_bill_to_key = dim_customer_bill_to.dim_customer_bill_to_key 
--WHERE 
-- 'ROW' < 2 
GROUP BY 
    invoice_number, 
    Dim_customer_bill_to.bill_to_code 
) base where RowNo < 2