Question

我使用sql server 2008并连接了多个列来生成值。但是，我想通过所有唯一交易来汇总平均交易成本。

Concatenated values = 
SELECT TOP 10 RTRIM(RTRIM(CAST(CENTER_NBR AS CHAR)) + CAST(DATEDIFF(ss, '19700101', SALES_DATE) AS CHAR(10)) + 
RTRIM(CAST(REGISTER_NBR AS CHAR)) + RTRIM(CAST(TRANSACTION_NBR AS CHAR)) + CAST(BUSINESS_ENTITY AS CHAR))  AS 'TRANS_KEY'
FROM dh_Transaction_Items;

需要找到以下内容：

ROUND(AVG(CAST(ITEM_QTY AS FLOAT)), 3) AS 'AVG ITEM QTY', 
ROUND(AVG(CAST(EXTENDED_PURCHASE_AMT AS FLOAT)), 3) AS 'AVG PURCHASE AMT',
ROUND(AVG(CAST(EXTENDED_SAVINGS_AMT AS FLOAT)), 3) AS 'AVG SAVINGS AMT',
ROUND(AVG(CAST(EXTENDED_COST_AMT AS FLOAT)), 3) AS 'AVG COST AMT',
ROUND(AVG(CAST(EXTENDED_MARGIN_AMT AS FLOAT)), 3) AS 'AVG MARGIN AMT'

基本上，我如何集成两组sql代码来获得平均值。

编辑：

我想找到整个表中五列的平均值（超过100万行）。连接一些列的原因是因为这是“所希望的”。唯一标识符是。因此，AVG应为每个“TRANS_KEY”添加购买金额。并除以总值（超过100万）。

Answer 1

您需要GROUP BY子句才能获得每组聚合

SELECT
  RTRIM(RTRIM(CAST(CENTER_NBR AS CHAR)) + CAST(DATEDIFF(ss, '19700101', SALES_DATE) AS CHAR(10)) + 
RTRIM(CAST(REGISTER_NBR AS CHAR)) + RTRIM(CAST(TRANSACTION_NBR AS CHAR)) + CAST(BUSINESS_ENTITY AS CHAR))  AS 'TRANS_KEY'
 ,ROUND(AVG(CAST(ITEM_QTY AS FLOAT)), 3) AS 'AVG ITEM QTY', 
 ,ROUND(AVG(CAST(EXTENDED_PURCHASE_AMT AS FLOAT)), 3) AS 'AVG PURCHASE AMT',
 ,ROUND(AVG(CAST(EXTENDED_SAVINGS_AMT AS FLOAT)), 3) AS 'AVG SAVINGS AMT',
 ,ROUND(AVG(CAST(EXTENDED_COST_AMT AS FLOAT)), 3) AS 'AVG COST AMT',
 ,ROUND(AVG(CAST(EXTENDED_MARGIN_AMT AS FLOAT)), 3) AS 'AVG MARGIN AMT'
FROM dh_Transaction_Items
GROUP BY CENTER_NBR, SALES_DATE, REGISTER_NBR, TRANSACTION_NBR, BUSINESS_ENTITY;

Answer 2

您可以先选择不同的交易，然后通过将qty / amt的总和除以唯一交易的数量来计算平均值，如下所示：

WITH distinct_transactions AS
(
    SELECT
    DISTINCT 
RTRIM(RTRIM(CAST(CENTER_NBR AS CHAR)) + CAST(DATEDIFF(ss, '19700101', SALES_DATE) AS CHAR(10)) + 
    RTRIM(CAST(REGISTER_NBR AS CHAR)) + RTRIM(CAST(TRANSACTION_NBR AS CHAR)) + CAST(BUSINESS_ENTITY AS CHAR)) AS TRANS_KEY
    CAST(ITEM_QTY AS FLOAT) AS ITEM QTY, 
    CAST(EXTENDED_PURCHASE_AMT AS FLOAT) AS PURCHASE AMT,
    CAST(EXTENDED_SAVINGS_AMT AS FLOAT) AS SAVINGS AMT,
    CAST(EXTENDED_COST_AMT AS FLOAT) AS COST AMT,
    CAST(EXTENDED_MARGIN_AMT AS FLOAT) AS MARGIN AMT
    FROM dh_Transaction_Items
)
SELECT
    ROUND((SUM(ITEM_QTY) / COUNT(TRANS_KEY)), 3) AS AVG_ITEM_QTY,
    ROUND((SUM(PURCHASE_AMT) / COUNT(TRANS_KEY)), 3) AS AVG_PURCHASE AMT,
    ROUND((SUM(SAVINGS_AMT) / COUNT(TRANS_KEY)), 3) AS AVG_SAVINGS AMT,
    ROUND((SUM(COST_AMT) / COUNT(TRANS_KEY)), 3) AS AVG_COST AMT,
    ROUND((SUM(MARGIN_AMT) / COUNT(TRANS_KEY)), 3) AS AVG_MARGIN AMT
FROM distinct_transactions;

使用连接值来查找平均值

2 个答案: