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Using CASE in A WHERE Clause

Posted on 2009-04-05
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Last Modified: 2012-05-06
I am trying to use CASE in a WHERE clause but NO LUCK as I get incorrect syntax?

I want to return results where Start is > Getdate - 1t minutes

On the question preview I cannot see the plus signs so it should be like this

'tblFileList.ListDate (plus sign) ColumnData'
SELECT

	tblOrder.CaseID,

	tblOrder.OrderID,

	tblOrderTask.Alert,

	tblOrderTask.TaskID,

	CASE

		WHEN AlertDurationID = 0 THEN tblFileList.ListDate + ColumnData

		WHEN AlertDurationID = 1 THEN DATEADD(n, AlertStart, tblFileList.ListDate + ColumnData)

		WHEN AlertDurationID = 2 THEN DATEADD(hh, AlertStart, tblFileList.ListDate + ColumnData)

		WHEN AlertDurationID = 3 THEN DATEADD(dd, AlertStart, tblFileList.ListDate + ColumnData)

		WHEN AlertDurationID = 4 THEN DATEADD(ww, AlertStart, tblFileList.ListDate + ColumnData)

		WHEN AlertDurationID = 5 THEN DATEADD(mm, AlertStart, tblFileList.ListDate + ColumnData)

	END As Start

FROM

	tblOrder

INNER JOIN

	tblOrderTask

ON

	tblOrder.OrderID = tblOrderTask.OrderID

INNER JOIN

	tblFileListColumn

INNER JOIN

	tblFileList

ON

	tblFileListColumn.FileListID = tblFileList.FileListID

ON

	tblOrder.CaseID = tblFileList.CaseId

INNER JOIN

	tblDuration

ON

	tblOrderTask.AlertDurationID = tblDuration.DurationID

WHERE

	(tblOrderTask.Alert = 1)

AND

	(tblFileListColumn.ColumnTypeID = 1)

AND

	(tblOrderTask.TaskStatusID > 2)

AND

	CASE

		WHEN AlertDurationID = 0 THEN (tblFileList.ListDate + ColumnData) > DATEADD(n, -15,GETDATE())

		WHEN AlertDurationID = 1 THEN DATEADD(n, AlertStart, tblFileList.ListDate + ColumnData) > DATEADD(n, -15,GETDATE())

		WHEN AlertDurationID = 2 THEN DATEADD(hh, AlertStart, tblFileList.ListDate + ColumnData) > DATEADD(n, -15,GETDATE())

		WHEN AlertDurationID = 3 THEN DATEADD(dd, AlertStart, tblFileList.ListDate + ColumnData) > DATEADD(n, -15,GETDATE())

		WHEN AlertDurationID = 4 THEN DATEADD(ww, AlertStart, tblFileList.ListDate + ColumnData) > DATEADD(n, -15,GETDATE())

		WHEN AlertDurationID = 5 THEN DATEADD(mm, AlertStart, tblFileList.ListDate + ColumnData) > DATEADD(n, -15,GETDATE())

	END

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Question by:MMTadmin
  • 3
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6 Comments
 
LVL 25

Assisted Solution

by:lwadwell
lwadwell earned 400 total points
ID: 24073672
Hi MMTadmin,

The comparison in the where cannot be inside the CASE, but the data you wish to use in the comparison can be returned by the CASE ... try

lwadwell
AND
      CASE
            WHEN AlertDurationID = 0 THEN (tblFileList.ListDate + ColumnData)  
            WHEN AlertDurationID = 1 THEN DATEADD(n, AlertStart, tblFileList.ListDate + ColumnData) 
            WHEN AlertDurationID = 2 THEN DATEADD(hh, AlertStart, tblFileList.ListDate + ColumnData) 
            WHEN AlertDurationID = 3 THEN DATEADD(dd, AlertStart, tblFileList.ListDate + ColumnData) 
            WHEN AlertDurationID = 4 THEN DATEADD(ww, AlertStart, tblFileList.ListDate + ColumnData) 
            WHEN AlertDurationID = 5 THEN DATEADD(mm, AlertStart, tblFileList.ListDate + ColumnData) 
      END > DATEADD(n, -15,GETDATE())

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Author Comment

by:MMTadmin
ID: 24073699
Line 13: Incorrect syntax near '>'. same as I was getting before
0
 
LVL 2

Accepted Solution

by:
MMTadmin earned 0 total points
ID: 24073711
You were correct - thanks


WHERE

	(tblOrderTask.Alert = 1)

AND

	(tblFileListColumn.ColumnTypeID = 1)

AND

	(tblOrderTask.TaskStatusID > 2)

AND

	CASE

		WHEN AlertDurationID = 0 THEN tblFileList.ListDate + ColumnData

		WHEN AlertDurationID = 1 THEN DATEADD(n, AlertStart, tblFileList.ListDate + ColumnData)

		WHEN AlertDurationID = 2 THEN DATEADD(hh, AlertStart, tblFileList.ListDate + ColumnData)

		WHEN AlertDurationID = 3 THEN DATEADD(dd, AlertStart, tblFileList.ListDate + ColumnData)

		WHEN AlertDurationID = 4 THEN DATEADD(ww, AlertStart, tblFileList.ListDate + ColumnData)

		WHEN AlertDurationID = 5 THEN DATEADD(mm, AlertStart, tblFileList.ListDate + ColumnData)

	END < DATEADD(n, -15, GETDATE())

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LVL 75

Assisted Solution

by:Anthony Perkins
Anthony Perkins earned 100 total points
ID: 24073727
Try it this way:
WHERE	tblOrderTask.Alert = 1

		AND tblFileListColumn.ColumnTypeID = 1

		AND tblOrderTask.TaskStatusID > 2

		AND	(

			AlertDurationID = 0 And (tblFileList.ListDate + ColumnData) > DATEADD(n, -15,GETDATE())

			Or AlertDurationID = 1 And DATEADD(n, AlertStart, tblFileList.ListDate + ColumnData) > DATEADD(n, -15,GETDATE())

			Or AlertDurationID = 2 And DATEADD(hh, AlertStart, tblFileList.ListDate + ColumnData) > DATEADD(n, -15,GETDATE())

			Or AlertDurationID = 3 And DATEADD(dd, AlertStart, tblFileList.ListDate + ColumnData) > DATEADD(n, -15,GETDATE())

			Or AlertDurationID = 4 And DATEADD(ww, AlertStart, tblFileList.ListDate + ColumnData) > DATEADD(n, -15,GETDATE())

			Or AlertDurationID = 5 And DATEADD(mm, AlertStart, tblFileList.ListDate + ColumnData) > DATEADD(n, -15,GETDATE())

			)

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Author Comment

by:MMTadmin
ID: 24073754
Sorry I mucked up everything the web site went crazy on me  ;-)
0
 
LVL 75

Expert Comment

by:Anthony Perkins
ID: 24073791
>>Response was good - to acperkins, thanks for answering the question also I appreciate it, when I get enough data I will try that .. but I am wondering how that even works,an OR instead of a case ... weird ;-)<<
Actually it is quite the opposite.  There is very rarely a need to use a CASE statement in a WHERE clause and in general it should be avoided for exactly the reason you have discovered:  It is a PITA to debug.
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