Question

Afternoon good people of Stack Overflow.

I am trying to do something that I am not certain how to achieve with my SQL knowledge, but I have a clear idea what it is I want out of this so hopefully this will make sense to people.

I have some perfmon disk results that look like this:

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

These are example rows based on this query:

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

What I want is this:

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

Does anyone know how I can achieve this? basically applying the rows onto themselves?

If any clarification is needed please feel free to ask.

Thanks!

Answer 1

The following statement calculates separate averages for each server in a fixed number of columns (from 1 to 5):

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

You can use PIVOT as well, but this syntax is supported by a broader range of SQL flavors.