SQL查询来选择总

Question

的百分比我有了一个表中以下列的MSSQL表店：

Storeid, NumEmployees 
1  125 
2  154 
3  10 
4  698 
5  54 
6  98 
7  87 
8  100 
9  58 
10  897 

有人可以帮助我的SQL查询产生顶部店（STOREID），有30％的员工（NumEmployees）？不使用SUM/OVER

SELECT s.storeid, s.numemployees 
FROM (SELECT SUM(numemployees) AS [tots] 
     FROM stores) AS t, 
     stores s 
WHERE CAST(numemployees AS DECIMAL(15, 5))/tots >= .3 
ORDER BY s.numemployees desc 

Working Demo

注意的是，在第二个版本，我决定不除以100乘以之前

Answer 1

WITH cte 
    AS (SELECT storeid, 
       numemployees, 
       (numemployees * 100)/SUM(numemployees) OVER (PARTITION BY 1) 
       AS 
       percentofstores 
     FROM stores) 
SELECT * 
FROM cte 
WHERE percentofstores >= 30 
ORDER BY numemployees desc 

Working Demo

替代。这需要铸造小数否则它会隐式转换为int导致没有记录返回

另外我不完全清楚，你想要这个，但你可以添加TOP 1两个查询，它会限制结果只是在一个设有专卖店的最大＃有超过30％

UPDATE

根据您的意见听起来套用Kevin

您想要的行，开始在商店最员工和工作，直到你至少有30％

这是困难的，因为它需要一个正在运行的百分比但其一个装箱问题这样做的工作。注意我已经包括另外两个测试案例（其中百分比恰好等于和它只是在上面两个组合）

Working Demo

DECLARE @percent DECIMAL (20, 16) 

SET @percent = 0.3 
--Other test values 
--SET @percent = 0.6992547128452433 
--SET @percent = 0.6992547128452434 

;WITH sums 
    AS (SELECT DISTINCT s.storeid, 
         s.numemployees, 
         s.numemployees + Coalesce(SUM(s2.numemployees) OVER ( 
                PARTITION 
                BY 
                s.numemployees), 0) 
         runningsum 
     FROM stores s 
       LEFT JOIN stores s2 
        ON s.numemployees < s2.numemployees), 
    percents 
    AS (SELECT storeid, 
       numemployees, 
       runningsum, 
       CAST(runningsum AS DECIMAL(15, 5))/tots.total 
       running_percent, 
       Row_number() OVER (ORDER BY runningsum, storeid) rn 
     FROM sums, 
       (SELECT SUM(numemployees) total 
       FROM stores) AS tots) 
SELECT p.storeID, 
     p.numemployees, 
     p.running_percent, 
     p.running_percent, 
     p.rn 
FROM percents p 
     CROSS JOIN (SELECT MAX(rn) rn 
        FROM percents 
        WHERE running_percent = @percent) exactpercent 

     LEFT JOIN (SELECT MAX(rn) rn 
        FROM percents 
        WHERE running_percent <= @percent) underpercent 
     ON p.rn <= underpercent.rn 
      OR (exactpercent.rn IS NULL 
        AND p.rn <= underpercent.rn + 1) 
WHERE 
     underpercent.rn is not null or p.rn = 1