From In To Exists

Dec 6, 2007

Dear all,
i'm trying to replace in with exists...
i've changed the query but still i'm getting error.
please let me know where i'm missing

DELETE FROM table25 WHERE Col6='SET' AND Col1 IN (SELECT s.Col1 FROM Table24 s
WHERE Col2='some_data1' AND Col3='some_data2' AND Col4='somedata3')

DELETE FROM table25 r WHERE r.Col6='SET' AND exists (SELECT s.Col1 FROM Table24 s
WHERE r.col1=s.col2 and Col2='some_data1' AND Col3='some_data2' AND Col4='somedata3')

thank you very much


Vinod
Even you learn 1%, Learn it with 100% confidence.

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IF NOT EXISTS (... - EXISTS TABLE : Nested Iteration. Table Scan.Forward Scan.

Sep 20, 2006

Hi,

This is on Sybase but I'm guessing that the same situation would happen on SQL Server. (Please confirm if you know).

I'm looking at these new databases and I'm seeing code similar to this all over the place:

if not exists (select 1 from dbo.t1 where f1 = @p1)
begin
select @errno = @errno | 1
end

There's a unique clustered in dex on t1.f1.

The execution plan shows this for this statement:

FROM TABLE
dbo.t1
EXISTS TABLE : nested iteration.
Table Scan.
Forward scan.
Positioning at start of table.

It's not using my index!!!!!

It seems to be the case with EXISTS statements. Can anybody confirm?

I also hinted to use the index but it still didn't use it.

If the existence check really doesn't use the index, what's a good code alternative to this check?

I did this and it's working great but I wonder if there's a better alternative. I don't really like doing the SET ROWCOUNT 1 and then SET ROWCOUNT 0 thing. SELECT TOP 1 won't work on Sybase, :-(.

SET ROWCOUNT 1
SELECT @cnt = (SELECT 1 FROM dbo.t1 (index ix01)
WHERE f1 = @p1
)
SET ROWCOUNT 0

Appreciate your help.

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Jul 7, 2006

Hello,
I am trying to create a table if one with the same name does not exists.  My code is:
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Dim sqlConnection As SqlConnection = New SqlConnection(connectionString)
Dim newTable As String = "CREATE TABLE [" + titleString + "Comments" + "] (ID int NOT NULL PRIMARY KEY IDENTITY, Title varchar(100) NOT NULL, Name varchar(100) NOT NULL, Comment varchar(MAX) NOT NULL, Date datetime NOT NULL)"
sqlConnection.Open()
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May 27, 2007

ok i have 2 tables---one table is name CourseInformation with a field named Instructor and the data in there looks like this 'John Doe'.
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Hi,

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Hi,
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hi guys! is there anyway to retrieve the row from the result of EXISTS function aside from using the code below?


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May 16, 2008

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Hi

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Hi,

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Thanks&Regards,

Msrs

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@url varchar
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I've also tried:


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--------------------------
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--------------------------
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Hi,
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Code Block

declare @Return int

if exists(select id from Computer where Computer_name = 'MYCOMPUTER')
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PRINT @Return
end
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Well, finally I lost one day to find a solution for a simple problem. I
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My last question for today:



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The Query:



SELECT
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P.D.: The ExtendedValues Function:



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Code:


Table:PR
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567-890 2000 01
567-890 2000 02

Table:PR_Template
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1000 00
1000 01
1000 02
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Order by wbs2, wbs3 asc

Thank You

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Question About IF NOT EXISTS

Aug 3, 2004

Hello all,

I keep getting Invalid parameter binding(s). errors when using the following IF NOT EXISTS statement.

Any ideas?

IF NOT EXISTS
(select mobile_number
FROM tblCustomer
WHERE mobile_number = 'nParam'
AND op_id = 'opParam'
)
BEGIN
INSERT INTO tblCustomer (
mobile_number, op_id
) VALUES (
'nParam',
'opParam'
)
END


Many thanks

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If Exists Column ?

Nov 30, 2005

Hello

How do you check if a column exist ?

for a table :

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[myTable]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[myTable]
GO

but I dont find it for a column

Thank you

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