將多行SQL轉換為一行

Question

下午的人很好的堆棧溢出。

我正在嘗試做一些不確定的事情，但我不確定如何利用SQL知識來實現​​，但是我很清楚自己想要什么，因此希望這對人們有意義。

我有一些如下所示的perfmon磁盤結果：

DatabaseName    ObjectName      CounterName         InstanceName                Server      Average
DAG1DB01        logicaldisk     avg. disk sec/read  d:\mountpoints\DAG1DB01     Server1     13.616
DAG1DB01        logicaldisk     avg. disk sec/read  d:\mountpoints\DAG1DB01     Server2     17.508
DAG1DB01        logicaldisk     avg. disk sec/read  d:\mountpoints\DAG1DB01     Server3     12.775
DAG1DB01        logicaldisk     avg. disk sec/read  d:\mountpoints\DAG1DB01     Server4     13.148
DAG1DB01        logicaldisk     avg. disk sec/read  d:\mountpoints\DAG1DB01     Server5     10.091

這些是基於此查詢的示例行：

SELECT
e14_db.DatabaseName AS [DatabaseName],
d.ObjectName,
d.CounterName,
d.InstanceName,
d.Server,
AVG(Value) * 1000 AS [Average]
FROM E14_Perfmon_MBX AS d
INNER JOIN E14_Databases AS e14_db
ON e14_db.LogFolderPath = d.InstanceName
WHERE d.ObjectName = 'logicaldisk'
AND d.CounterName = 'avg. disk sec/read'
AND d.DateTime > (DATEADD(hh, -4, GETDATE()))
AND d.Value < 1
GROUP BY d.ObjectName, d.CounterName, d.InstanceName, d.Server, e14_db.DatabaseName
ORDER BY e14_db.DatabaseName, d.Server

我想要的是：

DatabaseName    ObjectName      CounterName         InstanceName                Server1     Server2     Server3     Server4     Server5
DAG1DB01        logicaldisk     avg. disk sec/read  d:\mountpoints\DAG1DB01     13.616      17.508      12.775      13.148      10.091

有誰知道我怎么能做到這一點？ 基本上將行應用於自己？

如果需要任何澄清，請隨時提出。

謝謝！

Answer 1

PIVOT運算符設計用於這種情況。 這應該給您您想要的東西：

SELECT DatabaseName, 
    ObjectName, 
    CounterName, 
    InstanceName, 
    Server1, 
    Server2, 
    Server3, 
    Server4, 
    Server5 
FROM (SELECT
        e14_db.DatabaseName AS [DatabaseName],
        d.ObjectName,
        d.CounterName,
        d.InstanceName,
        d.[Server],
        d.Value * 1000 AS [Value]
    FROM E14_Perfmon_MBX AS d
        INNER JOIN E14_Databases AS e14_db
            ON e14_db.LogFolderPath = d.InstanceName
    WHERE d.ObjectName = 'logicaldisk'
        AND d.CounterName = 'avg. disk sec/read'
        AND d.DateTime > (DATEADD(hh, -4, GETDATE()))
        AND d.Value < 1) sub
PIVOT
(
    AVG(Value)
    FOR [Server] IN ([Server1], [Server2], [Server3], [Server4], [Server5])
) AS PivotTable

Answer 2

以下語句以固定的列數（從1到5）計算每個服務器的獨立平均值：

SELECT e14_db.DatabaseName AS [DatabaseName]
, d.ObjectName, d.CounterName, d.InstanceName
, AVG(CASE WHEN d.Server = 'Server1' THEN Value ELSE NULL END) *1000 AS [Server1]
, AVG(CASE WHEN d.Server = 'Server2' THEN Value ELSE NULL END) *1000 AS [Server2]
, AVG(CASE WHEN d.Server = 'Server3' THEN Value ELSE NULL END) *1000 AS [Server3]
, AVG(CASE WHEN d.Server = 'Server4' THEN Value ELSE NULL END) *1000 AS [Server4]
, AVG(CASE WHEN d.Server = 'Server5' THEN Value ELSE NULL END) *1000 AS [Server5]
FROM E14_Perfmon_MBX AS d
INNER JOIN E14_Databases AS e14_db
ON e14_db.LogFolderPath = d.InstanceName
WHERE d.ObjectName = 'logicaldisk'
AND d.CounterName = 'avg. disk sec/read'
AND d.DateTime > (DATEADD(hh, -4, GETDATE()))
AND d.Value < 1
GROUP BY d.ObjectName, d.CounterName, d.InstanceName, e14_db.DatabaseName
ORDER BY e14_db.DatabaseName

您也可以使用PIVOT ，但是各種SQL 風格都支持此語法。

Answer 3

方法1

點擊這里查看演示

declare @Servers varchar(1000) = ''
declare @Query varchar(8000) = ''


select @Servers = ISNULL(QuoteName(Server) + ',', '') + @Servers from MyTable

set @Servers = SUBSTRING(@Servers,0,len(@Servers))

Set @Query = 'Select DatabaseName, obectName, CounterName, InstanceName , ' + 
@Servers + ' From 
(
    Select DatabaseName, obectName, CounterName, InstanceName, 
    Server, Average from Mytable
)K Pivot
(
    max(Average) FOR Server IN (' + @Servers + ')
) AS pvt'

EXEC(@Query)

方法＃2

點擊這里查看演示

Select DatabaseName, obectName, CounterName, InstanceName , Server1, Server2, 
Server3, Server4, Server5
From 
(
    Select Select DatabaseName, obectName, CounterName, InstanceName, 
    Server, Average from Mytable FROM Mytable
)K
Pivot
(
    Max(Average) FOR Server IN (Server1, Server2, Server3, Server4, Server5)
) AS pvt

Answer 4

嘗試為每個服務器加入一次PERFMON表，如下所示：

FROM E14_Databases AS e14_db
INNER JOIN E14_Perfmon_MBX AS server1
ON e14_db.LogFolderPath = server1.InstanceName 
AND server1.Server = 'Server1'
AND server1.ObjectName = 'logicaldisk'
AND server1.CounterName = 'avg. disk sec/read'
AND server1.DateTime > (DATEADD(hh, -4, GETDATE()))
AND server1.Value < 1
INNER JOIN E14_Perfmon_MBX AS server2
ON e14_db.LogFolderPath = server2.InstanceName 
AND server2.Server = 'Server2'
AND server2.ObjectName = 'logicaldisk'
AND server2.CounterName = 'avg. disk sec/read'
AND server2.DateTime > (DATEADD(hh, -4, GETDATE()))
AND server2.Value < 1

然后為每個聯接添加一列：

AVG(Server1.Value) * 1000 AS [Server1]

Answer 5

看一下此鏈接所示的PIVOT表語法。

數據透視表示例

這將使您可以執行自己的要求。 確保查看具有動態生成列標題的部分。

Answer 6

修改表以包含額外的列，並運行更新，其中server ='Server2'

更新d設置server2 =先前服務器條目的值（例如，其中server ='server2'）

這樣做是很痛苦的，但是唯一的選擇是不使用SQL語句實際編輯表。

編輯：我建議制作2張桌子，一張帶有所有信息（數據庫名稱等），然后一張帶有分數