MSSQL - OVER、ROW_NUMBER() 和 ORDER BY 错误

Question

我正在尝试进行查询，以输出包含公司数据和每个公司的产品和折扣数量的列表，并按 product_count 排序。我还需要将输出限制为 30 行的组

SELECT * FROM (
    SELECT *, (
        SELECT COUNT(*) FROM Products WHERE Product_Comp_id = Comp_id
    ) as product_count, (
        SELECT COUNT(*) FROM Discount WHERE Disc_Comp_id = Comp_id
    ) as discount_count , ROW_NUMBER() OVER (
        ORDER BY product_count ASC
    ) AS RowNum FROM Company
) AS finalTable WHERE finalTable.RowNum BETWEEN 0 AND 30

但是我得到这个错误

Invalid column name 'product_count'.

Table 结构

Products
    |-Product_id
    |-Product_Name
    |-Product_Description
    |-Product_Comp_id

Discount
    |-Disc_id
    |-Disc_Name
    |-Disc_Comp_id
    |-Disc_Ammount

Company
    |-Comp_id
    |-Comp_Name
    |-Comp_Address

Answer 1

您需要额外的子查询级别才能为您提供 product_count。

SELECT * FROM (
    SELECT * , ROW_NUMBER() OVER (ORDER BY product_count ASC) AS RowNum
    FROM 
    (
        SELECT *, (SELECT COUNT(*) FROM Products WHERE Product_Comp_id = Comp_id) as product_count, 
        (SELECT COUNT(*) FROM Discount WHERE Disc_Comp_id = Comp_id) as discount_count
        FROM Company
    ) C
) AS finalTable WHERE finalTable.RowNum BETWEEN 0 AND 30

MSSQL - OVER、ROW_NUMBER() 和 ORDER BY 错误

MSSQL - OVER, ROW_NUMBER() and ORDER BY error

sql

sql-server

window-functions