Dynamic Where Clause

Aug 23, 2007

I am trying to write a stored procedure usp_select using dynamic sql to select from a table. The stored procedure will accept the where clause and/or the where clause parameters. I have tried 3 different methods -

Method 1 -
exec usp_select @whereCondition='col1 like ''abc%'' and col2 = ''xyz'''
In usp_select, I'll build and execute the sql like -
set @sql = N'select * from table ' + @whereConition
exec sp_executesql @sql
(basically @sql becomes - select * from table where col1 like 'abc%' and col2 = 'xyz')

Method 2 -
exec usp_select @whereCondition='col1 like @p1 and col2 = @p2', @WhereParams='@p1=abc%,@p2=xyz'

In usp_select, I'll parse out the values in @WhereParams and then build and execute the sql like -

set @sql = N'declare @p1 nvarchar(10),
@p2 nvarchar(10);
set @p1 = ''' + @parsedValue1 + ''', @p2 = ''' + @parsedValue2 + '''; ' +

N'select col1 from table1 ' + @whereCondition

exec (@sql)

(basically @sql becomes - declare @p1 nvarchar(10), @p2 nvarchar(10);
set @pt = 'abc%', @p2 = 'xyz';
select col1 from table1 where col1 like @p1 and col2 = @p2)


Method 3 -

similar to Method 2 but exec(@sql) will be structured to become -
exec(declare @vparam nvarchar(100), @p1 nvarchar(10), @p2 nvarchar(10);

set @vparam='@p1 nvarchar(10), @p2 nvarchar(10)'

set @p1 = 'abc%', @p2 = 'xyz';

execute sp_executesql N''select col1 from table1 where col1 like @p1 and col2 = @p2', @vparam, @p, @p2)

When I run sql profiler on the 3 methods, method 1 and 2 always result in a Cache Miss on the entire sql structure.
On method 3, a Cache Miss always occurs on the first part of the sql, ie, the first 3 lines where I declare and set the variables. Then a Cache Hit will happen on the execute sp_executesql part.

Do I have any performance gain using method 3 with both a Cache Miss and a Cache Hit?

I hope this is not too confusing. Because I do not know the where condition to the select procedure and hardcoding the values as in method 1 always results in a Cache Miss, therefore, I come up with the ideas in Method 2 and 3.

Any advice would be appreciated.

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Using Dynamic IN Clause

May 9, 2007

I am looking to do a dynamic IN clause, such as the following.create procedured usp_SPTest

@variable varchar(150)
AS

select * from table
where ID IN (@variable)
GO

Then execuuting this withusp_SPTest '''1'',''2'''
Basically this won't work and gives an error
Syntax error converting the varchar value ''1','2'' to a column of data type int.
which makes sense. Is there anyway to do this outside of a dynamic SQL statement?
According to http://www.sommarskog.se/dynamic_sql.html#List it doesn't look promising but unpacking the list into a table is a bit over board for this in my opinion. Any help is appreciated.

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Jul 19, 2007

Hi. I can't seem to get my dynamic where clause right.

The pseudo code is such:

when gender is not null and is not 'show all' then create the condition "when tab1.gender = @gender".
and, when country is not null and is not 'show all' then create the condition "when tab1.country = @country".
and, finally, create the condition where tab1.bday_year is
between @toage AND @fromage (this will never be empty or null).

I have tried many variations, the most recent being below.
But, the resulting data does not act as it should (or it won't compile) :


Code:


WHERECASEWHEN @gender <> 'show all' THEN tab1.gender = @gender
WHEN @country <> 'show all' THEN tab1.country = @country
tab1.bday_year BETWEEN @toage AND @fromage END



thanks for any suggestions provided.

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Nov 13, 2006

HiI need some advice on which direction to take!Consider this statement:SELECT business_name FROM myTable WHERE town = @town AND county = @countyMy problem is that i will not always have the @county variable available. Is there a way to use an IF or a CASE inside the SQL statement (i know i can create two seperate sql statments but dont want to do it this way)? If it makes it easier, when the @county variable is not available, it has a value of 0.thanks againPs, i also know how to do it using dynamic sql using the EXEC() command, but i'd prefer to steer clear of this method also.

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Dec 6, 2007

Hi all,

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the Where clause is (Status='Open' or Status='On Going' or Status='Hold' or Status='Close') And (Found_Date BETWEEN ' '2007-11-01'' And ''2007-11-30'')

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Sep 18, 2007

Hello everyone,

I want to build a dynamic where clause which makes :

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Best regards and thanks.

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Jan 29, 2008



I have a table (tblRestore) that has the following data
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C:DataProjectsBeaconPDA 1 Directory
C:DataProjectsBeaconBeaconVisual Studio 2005 0 Directory
C:DataProjectsBeaconVisual Studio 2005 0 Directory
C:DataProjectsBeaconPDAAuditPDAWM5 0 Directory


I want to use the data in this table to dynamically create a where clause that would look like this


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AND (ParentDirectory NOT LIKE('C:DataProjectsBeaconVisual Studio 2005%')

AND ParentDirectory NOT LIKE('C:DataProjectsBeaconBeaconVisual Studio 2005%')

AND ParentDirectory NOT LIKE('C:DataProjectsBeaconPDAAuditPDAWM5%')

)

Can I do this using Sql (Sql Compact 3.0)?

thanks,

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Mar 10, 2008

Hi

I'm using SQL Server 2000...

In a stored procedure I am trying to use a parameter in a where clause which is set dependent upon another parameter... ie if report 1 is run, I want to evaluate against the StartDate field ... otherwise evaluate against the EndDate field.

declare @StartDt datetime;
declare @EndDt datetime;
declare @WhereDate varchar(30);

if @report = 1 then
begin

set @WhereDate = 'Table.EndDate'
end
else set @WhereDate = 'Table.StartDate'

select *
from MyTable
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I'm getting syntax errors, so my question is.... is it possible... if so what syntax should I use?

Cheers

Jon

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May 21, 2007

Hi,
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AS

SELECT id, productName, productDescription

FROM products

WHERE @dynamicField = 'True'

RETURN   
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So my query variable should be, for example, "property1" and the result should be every row with "property1" set to true... but it doesnt work with the sql like this...
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Apr 14, 2008

I have a stored procedure which expects one parameter @Company
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SELECT *
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Thanks for your help

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Jun 26, 2007

I have 3 tables: Authors, Employee and Stores.
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My question is, how should I handle WHERE clause in stored procedure if I don’t want it to be a “dynamic WHERE�.

Thank you

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May 6, 2008

Hi,


I have a project which is need dynamically t-sql clause...I've created interface for the create dynamic t-sql clause.
But the clause should get data from relational database. It needs inner join...so it's very hard to do it..

for example


lkpProduct

id product
1 Mouse
2 Keyboard

3 Modem
4 Monitor


main

id productid

1 4
2 1
3 2
4 3
5 4

You can get this table with 2 ways like this..

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mytable

id product
1 Monitor
2 Mouse
3 Keyboard
4 Modem
5 Monitor


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I hope it is clear for you..

Regards.

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Apr 14, 2008

Hello,

I have a stored procedure which expects one parameter @Company
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I need to build a WHERE clause by parsing @Company value, so the select will look like below:

SELECT *
FROM Company
WHERE CompanyName = 'CNN'
AND CompanyName = 'AOL'
AND CompanyName = 'ABC'


P.S I know that above select doesn€™t really make sense , but I have a bigger query that would be hard to explain in this topic so I just simplified it.

Thank you

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Nov 16, 2007

Hi,

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DECLARE @PARAMDEF NVARCHAR(1000)
DECLARE @VALUES VARCHAR(100)

SET @PARAMDEF = N'@IN_VAL VARCHAR(100)'

SET @VALUES = '1,2,3,4'

SET @SQLQUERY = 'SELECT * FROM TABLEA WHERE COLUMNA IN (@IN_VAL)'

EXEC SP_EXECUTESQL @SQLQUERY,@PARAMDEF,@IN_VAL=@VALUES

This fails with the error "cannot convert varchar to numeric". I believe since ColumnA is numeric, its trying to convert the dynamic paramter to numeric leading to the failure.

has someone implemented an In clause as a parameter? Please do not tell me that I can append the values as string and construct a dynamic query. I want to use a parameterized version. I will be calling this repeatedly and dont want recompile overhead.

TIA

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Jun 13, 2006

Hello all...

I am trying rewrite an sp that I have that is considered dynamic cause it builds a where clause based on a bunch of if statements then adds it to the the end of select

i.e

if...@where = @where + ' llll '

if...@where = @where + ' llll '

select @statement = @statement + @where

exec(@statement)

I have rewritten most of it to but I have several conditions that use ' contains' for the condition and I can't get SQL server to recognize an if statement or a case statement.

Is it possible to use either statement inside a where clause??

i.e

where if a = 1 then d=e

else contains(.....)



thanks

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May 25, 2004

Hi all!
I need to create a stored procedure with a parameter and then send a WHERE clause to that parameter (fields in the clause may vary from time to time thats why I want to make it as dynamic as possible) and use it in the query like (or something like) this:

---------------------------------------------------
@crit varchar(100)

SELECT fldID, fldName FROM tblUsers
WHERE @crit
----------------------------------------------------

Of course this does not work, but I don't know how it should be done, could someone please point me in the right direction on how to do this kind of queries.

cheers!
pelle

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Jul 23, 2004

Hi, I have several parameters that I need to pass to stored procedure but sometimes some of them might be null. For example I might pass @Path, @Status, @Role etc. depending on the user. Now I wonder if I should use dynamic Where clause or should I use some kind of switch, maybe case and hardcode my where clause. I first created several stored procedures like Documents_GetByRole, Documents_GetByRoleByStatus ... and now I want to combine them into one SP. Which approach is better. Thanks for your help.

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Mar 2, 2006

Greetings,

I've search around quite extensively on the net and found a few examples that touch on this subject, but the only definitive one that seemed to solve this problem used a temp table in the UDF, which, to my knowledge, is impossible...

The problem is thus:
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The Solution I'm attempting:
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CREATE FUNCTION CashAccountIDs()

RETURNS TABLE

AS

BEGIN
DECLARE TABLE @t1 (account INT)
INSERT INTO @t1 VALUES (100)
INSERT INTO @t1 VALUES (101)
INSERT INTO @t1 VALUES (102)
INSERT INTO @t1 VALUES (407)
RETURN @t1
END

Then I could call this function by doing something such as:

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Not too certain if I am approaching this the correct way or not, I've been receiving a myriad of errors trying different methods. If I use the function above it tells me "Must declare @t1", so I modified it so @t1 is declared in the RETURNS statement, and the syntax checks then work, but when I attempt to save the function it tells me "Cannot perform alter on fn_cashaccountids because it is an incompatible object type"

(The code I use to generate this error is:
CREATE FUNCTION fn_cashaccountids ()

RETURNS @t1 TABLE (i INT)

AS

BEGIN
INSERT INTO @t1 VALUES (100)
RETURN
END

Hopefully I've provided enough but not too much info to sift through, it seems to me this would be something encountered a bit before.

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Aug 20, 2007

I have a stored procedure being called based on user search criteria. Some, the colour and vendor fields are optional in the search so i do not want that portion of the procedure to run.

at this point i keep getting errors in the section bolded below
it never seems to recognize anything after the if @myColours <> 'SelectAll'

CREATE Procedure PG_getAdvWheelSearchResults3
(
@SearchDiameter NVarchar( 20 ),
@SearchWidth NVarchar( 20 ),
@minOffset int ,
@maxOffset int ,
@boltpattern1 NVarchar( 20 ),
@VendorName NVarchar( 40 ),
@myColours NVarchar( 40 )
)
As
BEGIN TRANSACTION
SELECT *, dbo.VENDORS.*, dbo.WHEEL_IMAGES.Wheel_Thumbnail AS Wheel_Thumbnail, dbo.WHEEL_IMAGES.Wheel_Image AS Wheel_Image,
dbo.WHEELS.*, dbo.VENDOR_IMAGES.Vendor_Thumbnail AS Expr1, dbo.VENDOR_IMAGES.Vendor_AltTags AS Expr2
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dbo.WHEEL_IMAGES ON WHEEL_CHARACTERISTICS.Wheel_ID = dbo.WHEEL_IMAGES.Wheel_ID INNER JOIN
FILTER_CLIENT_WHEELS5 ON WHEEL_CHARACTERISTICS.Wheel_ID = FILTER_CLIENT_WHEELS5.Wheel_ID INNER JOIN
dbo.WHEELS ON WHEEL_CHARACTERISTICS.Wheel_ID = dbo.WHEELS.Wheel_ID INNER JOIN
CLIENT_WHEEL_PRICES5 ON FILTER_CLIENT_WHEELS5.Client_ID = CLIENT_WHEEL_PRICES5.ClientId AND
WHEEL_CHARACTERISTICS.Wheel_Char_ID = CLIENT_WHEEL_PRICES5.Wheel_Char_ID INNER JOIN
dbo.VENDOR_IMAGES ON dbo.VENDORS.Vendor_ID = dbo.VENDOR_IMAGES.Vendor_ID
WHERE (dbo.VENDORS.Vendor_Active = 'y') AND (FILTER_CLIENT_WHEELS5.FCW_Active = 'y')
AND (FILTER_CLIENT_WHEELS5.Client_ID = '1039')
AND (WHEEL_CHARACTERISTICS.Wheel_Diameter =@SearchDiameter)
AND (WHEEL_CHARACTERISTICS.Wheel_Width =@Searchwidth)
AND (WHEEL_CHARACTERISTICS.Wheel_Bolt_Pattern_1 = @boltpattern1)

if @myColours <> 'SelectAll'
and WHEEL_CHARACTERISTICS.Wheel_Search_Colour = @myColours
end if


AND (cast(WHEEL_CHARACTERISTICS.wheel_Offset as int(4)) BETWEEN @minOffset AND @maxOffset)

ORDER BY CLIENT_WHEEL_PRICES5.Price asc
COMMIT TRANSACTION
GO

Anyone know how i should word the if...statements?
I have not found anything that works yet.
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@WOENDDATE datetime = NULL,
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@DEBUG int=0
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GO
---

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I am working with a vendor on upgrading their application from SQL2K to SQL2K5 and am running into the following.

When on SQL Server 2000 the following statement ran without issue:

UPDATE dbo.Track_ID

SET dbo.Track_ID.Processed = 4 --Regular 1 leg call thats been completed

WHERE Processed = 0 AND LegNum = 1

AND TrackID IN

(


SELECT TrackID

FROM dbo.Track_ID

GROUP BY TrackID

HAVING MAX(LegNum) = 1 AND


TrackID + 'x1' IN


(


SELECT

dbo.Track_ID.TrackID + 'x' + CONVERT(NVARCHAR(2), COUNT(dbo.Track_ID.TrackID))

FROM dbo.Track_ID INNER JOIN dbo.transactions


ON dbo.Track_ID.SM_ID = dbo.transactions.sm_session_id

GROUP BY dbo.Track_ID.TrackID

)

)
Once moved to SQL Server 2005 the statement would not return and showed SOS_SCHEDULER_YIELD to be the waittype when executed. This machine is SP1 and needs to be upgraded to SP2, something that is not going to happen near time.

I changed the SQL to the following, SQL Server now runs it in under a second, but now the app is not functioning correctly. Are the above and the following semantically the same?


UPDATE dbo.Track_ID

SET dbo.Track_ID.Processed = 4 --Regular 1 leg call thats been completed

WHERE Processed = 0 AND LegNum = 1

AND TrackID IN
(



SELECT TrackID

FROM dbo.Track_ID

WHERE TrackID + 'x1' IN


(


SELECT dbo.Track_ID.TrackID + 'x' + CONVERT(NVARCHAR(2), COUNT(dbo.Track_ID.TrackID))

FROM dbo.Track_ID INNER JOIN dbo.transactions


ON dbo.Track_ID.SM_ID = dbo.transactions.sm_session_id

GROUP BY dbo.Track_ID.TrackID

)
GROUP BY TrackID

HAVING MAX(LegNum) = 1

)

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Importing Excel Sheet Which Have Dynamic Column Name And Dynamic Number Of Columns

Aug 25, 2007

Hi Craig/Kamal,

I got your email address from your web cast. I really enjoyed the web cast and found it to be
very informative.

Our company is planning to use SSIS (VS 2005 / SQL Server 2005). I have a quick question
regarding the product. I have looked for the information on the web, but was not able to find
relevant information.

We are getting Source data from two of our client in the form of Excel Sheet. These Excel sheets
Are generated using reporting services. On examining the excel sheet, I found out that the name
Of the columns contain data itself, so the names are not static such as Jan 2007 Sales, Feb 2007 Sales etc etc.
And even the number of columns are not static. It depends upon the range of date selected by the user.

I wanted to know, if there is a way to import Excel sheet using Integration Services by defining the position
Of column, instead of column name and I am not sure if there is a way for me to import excel with dynamic
Number of columns.

Your help in this respect is highly appreciated!

Thanks,


Hi Anthony, I am glad the Web cast was helpful.

Kamal and I have both moved on to other teams in MSFT and I am a little rusty in that area, though in general dynamic numbers of columns in any format is always tricky. I am just assuming its not feasible for you to try and get the source for SSIS a little closer to home, e.g. rather than using Excel output from Reporting Services, use the same/some form of the query/data source that RS is using.

I suggest you post a question on the SSIS forum on MSDN and you should get some good answers.
http://forums.microsoft.com/msdn/showforum.aspx?forumid=80&siteid=1
http://forums.microsoft.com/msdn/showforum.aspx?forumid=80&siteid=1

Thanks



Craig Guyer
SQL Server Reporting Services

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