Sql server SQL Server 2014:最大值和有查询

这里是自学成才的新手

我试图在EmplUDABreakdown表中最晚日期的52周内返回一组值

DECLARE @AVGEarn TABLE 
   (
     EmployeeCode VARCHAR(12)
     ,AVGEarn DECIMAL(12,2)
     ,Weeks INT
   )

INSERT INTO @AVGEarn
   SELECT 
       E.EmployeeCode,
       (SELECT SUM(EMPL.Amount) 
        FROM EMPLUDABreakdown EMPL 
        WHERE EMPL.EmployeeCode = E.EmployeeCode 
          AND EMPL.UserDefinedAccumulatorCode = 'AVGEARN' 
          AND DATE <= MAX(EMPL.[Date]) 
          AND DATE >= DATEADD(WEEK,-52,MAX(EMPL.[Date]))) AS AVGEarn,
       (SELECT COUNT(DISTINCT EMPL.[Date]) 
        FROM EMPLUDABreakdown EMPL 
        WHERE EMPL.EmployeeCode = E.EmployeeCode 
          AND EMPL.UserDefinedAccumulatorCode = 'AVGHRS' 
          AND DATE <= MAX(EMPL.[Date])  
          AND DATE >= DATEADD(WEEK,-52,MAX(EMPL.[Date])+1)) AS Weeks
   FROM 
       Employee E
   WHERE 
       E.TerminationDate IS NULL
   ORDER BY 
       E.EmployeeCode

   SELECT * FROM @AVGEarn

我得到一个错误：

Msg 147，15级，状态1，第15行 聚合不能出现在WHERE子句中，除非它位于HAVING子句或select列表中包含的子查询中，并且被聚合的列是外部引用

我改成

   (SELECT SUM(EMPL.Amount) 
    FROM EMPLUDABreakdown EMPL 
    WHERE EMPL.EmployeeCode = E.EmployeeCode 
      AND EMPL.UserDefinedAccumulatorCode = 'AVGEARN' 
    GROUP BY EMPL.[Date]
    HAVING DATE <= MAX(EMPL.[Date]) AND DATE >= DATEADD(WEEK,-52,MAX(EMPL.[Date]))) AS AVGEarn

并得到以下信息

Msg 512，16级，状态1，第8行 子查询返回了多个值。当子查询在=、！=、=或者当子查询用作表达式时

---

您的查询返回多行，因为您正在对其进行分组。你到底想要什么？一行合计，几行分组？有最大日期的总和行？您好。实际上，我希望返回一行，其中包含最近一周的最后52周内的SumEnearning和COUNTWeeks。非常感谢。