由于分组依据，每日平均值无法正确计算

我有以下 SQL，我试图在其中获得总计数的一个月内的每日平均值。

SELECT A.BUSINESS_UNIT, A.INV_ITEM_ID, C.MFG_ID, C.MFG_ITM_ID, 
 A.ADJUST_TYPE, A.QTY_BASE, A.UNIT_MEASURE_STD,
 A.DT_TIMESTAMP, B.DESCR254_MIXED, A.TRANSACTION_GROUP, 
 (CONVERT(CHAR(10),A.TRANSACTION_DATE,121)), A.DEPTID, B.PRICE_LIST, 
 A.DESTIN_GL_BU,  A.QTY_BASE* B.PRICE_LIST, (COUNT(*) * 1.0 / 31 ) AS 'Daily 
 Average'
FROM PS_TRANSACTION_INV A, (PS_PURCH_ITEM_ATTR B LEFT OUTER JOIN  
 PS_ITEM_MFG C ON  B.SETID = C.SETID AND B.INV_ITEM_ID = C.INV_ITEM_ID ), 
 PS_CM_ACCTG_DIST_D D 
WHERE ( A.BUSINESS_UNIT = '11MMS' 
 AND A.INV_ITEM_ID = B.INV_ITEM_ID 
 AND C.PREFERRED_MFG = 'Y' 
 AND A.TRANSACTION_DATE >= '05-01-2018' 
 AND A.TRANSACTION_DATE <= '05-31-2018' 
 AND A.BUSINESS_UNIT = D.BUSINESS_UNIT 
 AND A.INV_ITEM_ID = D.INV_ITEM_ID 
 AND D.TRANSACTION_GROUP = A.TRANSACTION_GROUP 
 AND A.INV_ITEM_ID = '1')
GROUP BY A.BUSINESS_UNIT, A.INV_ITEM_ID, C.MFG_ID, C.MFG_ITM_ID, 
 A.ADJUST_TYPE, A.QTY_BASE, A.UNIT_MEASURE_STD,
 A.DT_TIMESTAMP, B.DESCR254_MIXED, A.TRANSACTION_GROUP, 
 (CONVERT(CHAR(10),A.TRANSACTION_DATE,121)), A.DEPTID, B.PRICE_LIST, 
 A.DESTIN_GL_BU,  A.QTY_BASE* B.PRICE_LIST

使用上面运行的数据，我得到 36 行（我的计数）的输出，我将其除以 31（天），并期望每日平均值为 1.161，但是我的每日平均值的每一行输出为 0.032258（我确定为 1.16 / 36）。非聚合列在 Group By 中，但以某种方式扭曲了每日平均值。

如果我只对计算出的平均值运行查询，(COUNT(*) * 1.0 / 31 ) AS 'Daily Average'那么我会得到正确的每日平均值 1.161，所以我知道它与分组依据有关。提前致谢！

编辑：

运行此查询会产生 1.161 的正确结果，只是当我将它添加到上面的查询时， Group By 是我的结果不正确。这就是我试图在主查询中模仿的内容。SELECT (COUNT(*) * 1.0 / 31 ) AS 'Daily Average' FROM PS_TRANSACTION_INV A, (PS_PURCH_ITEM_ATTR B LEFT OUTER JOIN
PS_ITEM_MFG C ON B.SETID = C.SETID AND B.INV_ITEM_ID = C.INV_ITEM_ID ), PS_CM_ACCTG_DIST_D D WHERE ( A.BUSINESS_UNIT = '11MMS' AND A.INV_ITEM_ID = B.INV_ITEM_ID AND C.PREFERRED_MFG = 'Y' AND A.TRANSACTION_DATE >= '05-01-2018' AND A.TRANSACTION_DATE <= '05-31-2018' AND A.BUSINESS_UNIT = D.BUSINESS_UNIT AND A.INV_ITEM_ID = D.INV_ITEM_ID AND D.TRANSACTION_GROUP = A.TRANSACTION_GROUP AND A.INV_ITEM_ID = '1')