SQL 查询聚合可能不会出现在 WHERE 子句中 [英] SQL Query aggregate may not appear in WHERE clause

问题描述

我有这个 SQL 语句并且 SQL Server 给了我以下错误:

I have this SQL statement and SQL Server is giving me the following error:

聚合不能出现在 WHERE 子句中，除非它在包含在 HAVING 子句或选择列表中的子查询.

An aggregate may not appear in the WHERE clause unless it is in a subquery contained in a HAVING clause or a select list.

SELECT 
  SUM(M1.InvoiceTotal)-SUM(M1.AmountApplied) as PastDueAmount
  , M1.BillingID
  , M2.Name
  , M2.DelinquentDaysThreshold
  , M2.DelinquentAmountThreshold
  , DATEDIFF(d, MIN(BillingDate),GETDATE()) as DaysLate
FROM Invoices M1 
LEFT JOIN ClientAccounts M2 ON M1.BillingID = M2.ID
WHERE 
  InvoiceTotal <> AmountApplied
  AND M2.DelinquentDaysThreshold > DATEDIFF(d, MIN(BillingDate),GETDATE())
  OR (SUM(M1.InvoiceTotal)-SUM(M1.AmountApplied)) > M2.DelinquentAmountThreshold
GROUP BY 
  M1.BillingID
  , M2.Name
  , M2.DelinquentDaysThreshold
  , M2.DelinquentAmountThreshold

在 where 子句中，我只想提取最早未付帐单发票日期大于 DelinquentDaysThreshold(以天为单位)或 PastDueAmount(计算值)大于 DelinquentAmountThreshold 的记录.
出于某种原因，SQL Server 不喜欢汇总的金额.

In the where clause, I only want to pull records where the oldest unpaid Billing Invoice Date is greater than the DelinquentDaysThreshhold (in days), OR the PastDueAmount (a calculated value) is greater than the DelinquentAmountThreshold.
For some reason SQL Server does not like aggregated amounts.

推荐答案

使用错误消息提示的 HAVING，这需要 GROUP BY:

Use the HAVING as hinted by the error message, which requires a GROUP BY:

SELECT
    SUM(M1.InvoiceTotal)-SUM(M1.AmountApplied) as PastDueAmount, 
    M1.BillingID, M2.Name, 
    M2.DelinquentDaysThreshold, M2.DelinquentAmountThreshold,
    DATEDIFF(d, MIN(BillingDate),GETDATE()) as DaysLate
FROM
    Invoices M1
    LEFT JOIN
    ClientAccounts M2 ON M1.BillingID = M2.ID
WHERE
    InvoiceTotal <> AmountApplied
    AND
    M2.DelinquentDaysThreshold > DATEDIFF(d, MIN(BillingDate),GETDATE())
GROUP BY
    M1.BillingID, M2.Name, 
    M2.DelinquentDaysThreshold, M2.DelinquentAmountThreshold,
    DATEDIFF(d, MIN(BillingDate),GETDATE())
HAVING
    (SUM(M1.InvoiceTotal)-SUM(M1.AmountApplied)) > M2.DelinquentAmountThreshold

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