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How to place a condition in a filter criteria in t-sql?

Posted on 2016-11-21
12
102 Views
Last Modified: 2016-11-22
Hi Experts,

I'm building a dynamic sql string and looking for the following.

Lets say there are two fields a text field (varchar 1000) and a date field.

Now I would like to filter for a date range in the date field, lets say between '1/1/16' and '2/1/16' but that should only be in case the text field contains a certain wording something like '%My Wording%'.

However in case the text field does not contain that word then I would want to see the record regardless of the date.

What is the simplest way to compose that?
(simple I mean in terms of clearness in reading, but at the same time should not compromise performance)
0
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Question by:bfuchs
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12 Comments
 
LVL 34

Expert Comment

by:Norie
ID: 41896751
How are you currently building the SQL statement?
0
 
LVL 4

Author Comment

by:bfuchs
ID: 41896758
Hi,

I'm using Access VBA to build that, its an ADP project so needs to be t-sql syntax.

Here is some extract of code...
    If Nz(txtLetterRange, "") <> "" Then
        If InStr(txtLetterRange, "-") > 0 Then
            sStr = sStr & " And  EmpName like '[" & txtLetterRange & "]%'"
        Else
            sStr = sStr & " And  EmpName like '" & txtLetterRange & "%'"
        End If
    End If

Open in new window

Thanks,
Ben
0
 
LVL 29

Expert Comment

by:Pawan Kumar
ID: 41896805
Here is the sample code for you --

WHERE DateFields >=  
                  CASE WHEN Wording LIKE '%My Wording%' THEN '1/1/16' ELSE DateFields END
AND
        DateFields <=  
                  CASE WHEN Wording LIKE '%My Wording%' THEN '2/1/16' ELSE DateFields END

CREATE TABLE Wordings
(
	 ID INT
	,Wording VARCHAR(100)
	,DateFields DATETIME
)
GO

INSERT INTO Wordings VALUES
(1,'My Wording','1/1/16'),
(2,'My Wording','2/1/16'),
(3,'Pawan','1/1/16'),
(4,'Ramehs','5/1/16'),
(5,'My Wording','5/1/16')
GO

SELECT * FROM Wordings

WHERE DateFields >=  
			CASE WHEN Wording LIKE '%My Wording%' THEN '1/1/16' ELSE DateFields END
AND 
	  DateFields <=  
			CASE WHEN Wording LIKE '%My Wording%' THEN '2/1/16' ELSE DateFields END

Open in new window


Output 

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Note - The code is filtering the records (5,'My Wording','5/1/16') since it date is outside our range.

ID          Wording                                                                                              DateFields
----------- ---------------------------------------------------------------------------------------------------- -----------------------
1           My Wording                                                                                           2016-01-01 00:00:00.000
2           My Wording                                                                                           2016-02-01 00:00:00.000
3           Pawan                                                                                                2016-01-01 00:00:00.000
4           Ramehs                                                                                               2016-05-01 00:00:00.000

(4 row(s) affected)

Open in new window


Hope it helps !!
0
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LVL 4

Author Comment

by:bfuchs
ID: 41896848
Hi Pawan,

Will test & let you know.

Thanks,
Ben
0
 
LVL 4

Author Comment

by:bfuchs
ID: 41896907
Hi,

The example you posted works for two particular dates, but I need it to work for a date range, something the follows

1- >= '1/1/16'

2- between '1/1/16' and '2/1/16'

tried modify your code but getting an error.

Thanks,
Ben
0
 
LVL 4

Author Comment

by:bfuchs
ID: 41896923
Hi Pawan,

Actually disregard my previous post, I see that do work for date range as well.

However I do have an issue with null values, meaning in your example if field wording is lets say 'pawan' and datefields is null it will not come up.

Let me know how to adjust that.

Thanks,
Ben
0
 
LVL 29

Accepted Solution

by:
Pawan Kumar earned 500 total points
ID: 41896928
Try this.

Option 1--

SELECT * FROM Wordings
WHERE ( DateFields >=  
			CASE WHEN Wording LIKE '%My Wording%' THEN '1/1/16' ELSE DateFields END OR DateFields IS NULL )
AND 
	  ( DateFields <=  
			CASE WHEN Wording LIKE '%My Wording%' THEN '2/1/16' ELSE DateFields END OR DateFields IS NULL )

Open in new window



Option 2


SELECT * FROM Wordings
WHERE 
	  ISNULL( DateFields , '' ) >=  CASE WHEN Wording LIKE '%My Wording%' THEN '1/1/16' ELSE ISNULL(DateFields ,'') END
AND 
	  ISNULL( DateFields, '') <=  CASE WHEN Wording LIKE '%My Wording%' THEN '2/1/16' ELSE ISNULL(DateFields ,'') END

Open in new window

0
 
LVL 4

Author Comment

by:bfuchs
ID: 41896934
OK, your second option seems to work, however will do additional testing tom & let you know.

Thanks,
Ben
0
 
LVL 29

Expert Comment

by:Pawan Kumar
ID: 41896938
Sure , I will wait for your +ve response. :)

Bye !!
0
 
LVL 4

Author Closing Comment

by:bfuchs
ID: 41898159
Hi Pawan,

This works great, Thank you!
0
 
LVL 4

Author Comment

by:bfuchs
ID: 41898177
BTW, is there a way to have the 'between '1/1/16' and '2/1/16' when using it in this case?

the reason for asking is that this would be easier for me to integrate into my app, as I have this syntax already for other cases.

Thanks,
Ben
0
 
LVL 4

Author Comment

by:bfuchs
ID: 41898232
Hi Pawan,

Sorry for letting you wait:)
I have another one for you..

https://www.experts-exchange.com/questions/28984854/How-to-place-a-condition-in-a-filter-criteria-in-t-sql-2.html

Thanks,
Ben
0

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