如何使用适当的密钥将表数据缩减到最小 - SQL？

Posted 2021-04-02

我正在使用MS SQL Server 2008，我有一个复杂的查询，它可以转动某些列以获得适当的数据报告。问题是，我正在使用连接和某些应该在同一个单元格中的单元格，如下图所示：

第19行和第20行应该是一行，绿色的单元格也应该在该行中，当然在适当的列中。

另外这是我的查询：

SELECT 

    Key1, Key2, Key3, Key4,
    [1] AS 'Kolona1', 
    [2] AS 'Kolona2', 
    [3] AS 'Kolona3', 
    [4] AS 'Kolona4', 
    [5] AS 'Kolona5',
    [6] AS 'Kolona6', 
    [7] AS 'Kolona7', 
    [8] AS 'Kolona8', 
    [9] AS 'Kolona9',
    [10] AS 'Kolona10', 
    [11] AS 'Kolona11', 
    [12] AS 'Kolona12', 
    [13] AS 'Kolona13',
    [14] AS 'Kolona14',
    [15] AS 'Kolona15',
    [16] AS 'Kolona16',
    [17] AS 'Kolona17',
    [18] AS 'Kolona18',
    [19] AS 'Kolona19',
    [20] AS 'Kolona20',
    [21] AS 'Kolona21',
    [22] AS 'Kolona22'

FROM   

(SELECT 
    v.Key1, v.Key2, v.Key3, v.Key4,
    v.Field1, r.Field2, v.Field3

    FROM MYDB.dbo.MY_TABLE_1 AS v

    INNER JOIN MYDB.dbo.MY_TABLE_2 AS r
    ON r.Key1 = v.Key1) as [P]  

PIVOT  
(  
    Max (Field2)  
    FOR Field1 IN (
        [1], [2], 
        [3], [4], 
        [5], [6], 
        [7], [8], 
        [9], [10], 
        [11], [12], 
        [13], [14], 
        [15], [16], 
        [17], [18], 
        [19], [20], 
        [21], [22])  
) AS pvt

我应该在一行中显示前面相同4个键的所有日期。

答案

是的外部SELECT仍然是SELECT，因此您可以添加GROUP BY或其他随附的东西。因此，我设法通过将外部SELECT与我的自定义条件分组来获得我想要的东西。我设法用一些更通用的替换我自己的字段名称。这是代码：

SELECT 
    Key1, Key2, 
    Key3, Key4, 
    Key5, Key6, 
    Key7, Key8, 
    Key9, Key10,

    Max([1]) AS 'controlCode1',
    Max([2]) AS 'controlCode2', 
    Max([3]) AS 'controlCode3', 
    Max([4]) AS 'controlCode4', 
    Max([5]) AS 'controlCode5', 
    Max([6]) AS 'controlCode6', 
    Max([7]) AS 'controlCode7', 
    Max([8]) AS 'controlCode8', 
    Max([9]) AS 'controlCode9', 
    Max([10]) AS 'controlCode10',
    Max([11]) AS 'controlCode11', 
    Max([12]) AS 'controlCode12',
    Max([13]) AS 'controlCode13',
    Max([14]) AS 'controlCode14', 
    Max([15]) AS 'controlCode15', 
    Max([16]) AS 'controlCode16', 
    Max([17]) AS 'controlCode17',
    Max([18]) AS 'controlCode18', 
    Max([19]) AS 'controlCode19', 
    Max([20]) AS 'controlCode20',
    Max([38]) AS 'controlCode21', 
    Max([39]) AS 'controlCode22' 

FROM 

    (SELECT distinct 
        v.Key2, v.Key3, 
        v.Year, v.Key6 as Period, 
        k.Key1, k.Key4, 
        k.Key5, k.Key6, 
        v.controlCode, r.Name, 
        v.controlDate, v.Key7,
        v.Key8, v.Key9, 
        v.Key10 

        FROM MyDB.dbo.VT_TABLE_1 AS v 

        INNER JOIN MyDB.dbo.KT_TABLE_2 as k 
        ON k.MyKey2 = v.Key2 AND k.MyKey1 = v.Key3

        INNER JOIN MyDB.dbo.DATES AS r 
        ON r.controlCode = v.controlCode AND (v.controlCode < 21 OR v.controlCode > 37)

        WHERE v.Year = Year

     ) as [P]

                PIVOT 
                ( 
                    Max (controlDate)
                    FOR controlCode IN (
                        [1], [2],
                        [3], [4],
                        [5], [6],
                        [7], [8],
                        [9], [10],
                        [11], [12],
                        [13], [14],
                        [15], [16],
                        [17], [18],
                        [19], [20],
                        [38], [39])
                ) AS pvt

     GROUP BY 

     Key1, Key2, 
     Key3, Key4, 
     Key5, Key6, 
     Key7, Key8, 
     Key9, Key10;