Question

我想创建一个查询来计算数据库中整体策略的销售百分比。这些政策分为两个单独的标题

UL
NL

我想要的代码应该显示

产品名称
已售出的政策数量
按产品销售的政策占销售政策总数的百分比。

我已尝试编写此代码的脚本（请参阅下文），但无法让它们正确运行。

语法1：

SELECT b.PRODUCT_NAME, b.POLICIES_SOLD, 100.00*(b.POLICIES_SOLD/SUM(b.POLICIES_SOLD)) AS'PERC_SALES'
FROM
(
SELECT a.PRODUCT_NAME, COUNT(a.PRODUCT_NAME) AS 
'POLICIES_SOLD'
    FROM 
    (SELECT PRODUCT_NAME FROM [ATLANTIS\jjudge].
[ALL_POLICIES_201706_NL]
    UNION ALL 
    SELECT PRODUCT_NAME FROM [ATLANTIS\jjudge].
[ALL_POLICIES_201706_UL])a GROUP BY PRODUCT_NAME)b ;

语法2：

SELECT a.PRODUCT_NAME, a.[POLICIES SOLD], 100.00*(a.[POLICIES SOLD]/SUM(a.[POLICIES SOLD])) 
FROM 
    (SELECT PRODUCT_NAME, COUNT(*) AS 'POLICIES SOLD'FROM 
[ATLANTIS\jjudge].[ALL_POLICIES_201706_NL] GROUP BY PRODUCT_NAME
    UNION ALL 
    SELECT PRODUCT_NAME, COUNT(*) AS 'POLICIES SOLD' FROM 
[ATLANTIS\jjudge].[ALL_POLICIES_201706_UL] GROUP BY  
PRODUCT_NAME)a ;

语法3：

SELECT b.PRODUCT_NAME, COUNT(b.PRODUCT_NAME) AS 
'POLICIES_SOLD', 100.00*
(COUNT(b.PRODUCT_NAME)/SUM(SELECT(PRODUCT_NAME)) 
    FROM
    (SELECT COUNT(*) AS 'POLICY_COUNT' FROM [ATLANTIS\jjudge].[ALL_POLICIES_201706_NL]
    UNION ALL
    SELECT COUNT(*) AS 'POLICY_COUNT' FROM [ATLANTIS\jjudge].[ALL_POLICIES_201706_UL])a)) AS 'PERC_SALES'
    FROM 
    (SELECT PRODUCT_NAME FROM [ATLANTIS\jjudge].
[ALL_POLICIES_201706_NL]
    UNION ALL 
    SELECT PRODUCT_NAME FROM [ATLANTIS\jjudge].
[ALL_POLICIES_201706_UL])b GROUP BY PRODUCT_NAME;

Answer 1

我想你想要一个Window功能。将语法1的第一行修改为：

SELECT 
    b.PRODUCT_NAME, 
    b.POLICIES_SOLD, 
    100.00*b.POLICIES_SOLD/SUM(b.POLICIES_SOLD) OVER () AS 'PERC_SALES'

Answer 2

您可以使用带窗口函数的单个聚合查询来执行此操作：

SELECT p.PRODUCT_NAME, COUNT(*) AS POLICIES_SOLD,
       COUNT(*) * 100.0 / SUM(COUNT(*)) OVER () as PERC_SALES
FROM ((SELECT PRODUCT_NAME
       FROM [ATLANTIS\jjudge].[ALL_POLICIES_201706_NL]
      ) UNION ALL 
      (SELECT PRODUCT_NAME
       FROM [ATLANTIS\jjudge].[ALL_POLICIES_201706_UL]
      )
     ) p
GROUP BY PRODUCT_NAME;

聚合COUNT函数的总和

2 个答案: