Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

Using CASE in A WHERE Clause

Posted on 2009-04-05
6
Medium Priority
?
201 Views
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

Open in new window

0
Comment
Question by:MMTadmin
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
6 Comments
 
LVL 25

Assisted Solution

by:lwadwell
lwadwell earned 1600 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())

Open in new window

0
 
LVL 2

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())

Open in new window

0
VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

 
LVL 75

Assisted Solution

by:Anthony Perkins
Anthony Perkins earned 400 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())
			)

Open in new window

0
 
LVL 2

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.
0

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

'Between' is such a common word we rarely think about it but in SQL it has a very specific definition we should be aware of. While most database vendors will have their own unique phrases to describe it (see references at end) the concept in common …
This article describes how to use the timestamp of existing data in a database to allow Tableau to calculate the prior work day instead of relying on case statements or if statements to calculate the days of the week.
In this video, Percona Solution Engineer Dimitri Vanoverbeke discusses why you want to use at least three nodes in a database cluster. To discuss how Percona Consulting can help with your design and architecture needs for your database and infras…
In this video, Percona Solutions Engineer Barrett Chambers discusses some of the basic syntax differences between MySQL and MongoDB. To learn more check out our webinar on MongoDB administration for MySQL DBA: https://www.percona.com/resources/we…

636 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question