Question

我有一个“Principal”表，可以有多个EmployeeId。对于每个员工ID，都有一个所有权百分比。此表还维护每个所有权百分比的主体名称。例如

EmpId                OwnershipPercent              Name
-------              -----------------             ---------
100                      50                           John
100                      30                           Neil
100                      20                           Mark

现在，我需要为每位员工获取其名称最高和第二高的所有权％。为此，我使用以下查询来获得所有权％： -

SELECT
    EmpId, CAST(isNULL([First], 0) AS DECIMAL (12,2)) [First OwnershipPercent], 
    CAST(isNULL([Second],0) AS DECIMAL (12,2)) [Second OwnershipPercent]
FROM 
(
    SELECT EmpId, OwnershipPercent, CASE WHEN SNo = 1 THEN 'First' ELSE 'Second' END [Priority]
    FROM
    (
        SELECT ROW_NUMBER() over(partition by MerchantId order by MerchantId, OwnershipPercent desc) [SNo], * 
        FROM ( SELECT DISTINCT EmpId, OwnershipPercent FROM Principal) t
    ) t1
    WHERE t1.SNo <=2
) t2
PIVOT
(
Avg(OwnershipPercent) FOR Priority IN ([First],[Second])
)AS pvt

我无法使用此查询获取每个％的名称。请帮忙

Answer 1

您可以执行GROUP BY并使用CASE WHEN。这样的事情。

;WITH CTE AS 
(
SELECT EmpId, Name,OwnershipPercent,ROW_NUMBER()OVER(PARTITION BY EmpId ORDER BY OwnershipPercent DESC) rn
FROM Principal
)
SELECT EmpID,
MAX(CASE WHEN rn = 1 THEN Name END) Highest,
MAX(CASE WHEN rn = 1 THEN OwnershipPercent END) Highest_perc,
MAX(CASE WHEN rn = 2 THEN Name END) SecondHighest,
MAX(CASE WHEN rn = 2 THEN OwnershipPercent END) SecondHighest_perc
FROM CTE
WHERE rn IN (1,2)
GROUP BY EmpID

Answer 2

SQL Server 2012支持其他窗口聚合函数，在这种情况下，您需要LEAD：

SELECT *
FROM
(
    SELECT
       MerchantId, 
       OwnershipPercent,      -- current row
       LEAD(OwnershipPercent) -- next row
       over(partition by MerchantId 
            order by OwnershipPercent desc) AS nextPercent,
       LEAD(Name) -- next row
       over(partition by MerchantId 
            order by OwnershipPercent desc) AS nextName,
       ROW_NUMBER(OwnershipPercent)
       over(partition by MerchantId 
            order by OwnershipPercent desc) AS SNo
    FROM Principal
    -- GROUP BY works the same as DISTINCT
    GROUP BY MerchantId, OwnershipPercent
 ) t
WHERE SNo = 1

SQL Server 2012查询 - 在一组记录中排名第二

2 个答案: