DELETE EXISTS Problems
Jul 3, 2006
I'm using a stored procedure to perform a complex DELETE. However, I'm having problems understanding how to do it. I'm trying the EXISTS keyword but Visual Studio is reporting the following error when I try to save it:
"The column prefix 'Experimental_Accommodation_Images' does not match with a table name or alias used in the query."
The code causing the problems is this: DELETE FROM Experimental_Images
WHERE EXISTS
(SELECT Experimental_Accommodation_Images.id
WHERE Experimental_Accommodation_Images.imageId = Experimental_Images.id
AND Experimental_Accommodation_Images.propertyId = @id)
What I'm trying to do is delete the correct items in the Experimental_Images table. This table contains image file information. Experimental_Accommodation_Images contains linkage information between the Experimental_Images table and the main data. Experimental_Accommodation_Images can hold up to 5 linkages to images for each 'Accommodation'. The ID of the Accommodation is passed to the SP via the @id.
So, what should be happening is that the DELETE command should be examining the Experimental_Accommodation_Images table, finding all the images that belong to the Accommodation with the ident value @id, and using the link between Experimental_Accommodation_Images.imageId and Experimental_Images.id to delete the file information rows from Experimental_Images. Unfortunately I'm not getting past first base on this one.
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Jun 18, 2007
Hi :1. I import data into sqlserver, from an excel file, from a worksheetwithin it, named 'input_data'2. then i scrub the data in sqlserver3. then i export some data into the same excelfile but into anotherworksheet named 'output_data'I have got it working and this is how i am doing it right now. I amhaving a problem in the few steps identified below :1. I delete the worksheet 'output_data' using an execsql taskDROP TABLE `output_data'2. Then i have another execsql task to create itCREATE TABLE `output_data`3. Then i have datapump task to put data into worksheet.The work fine, but i am running into a problem, when the output_dataworksheet doesnt exist.So i need to write a query tellingIF `output_data` doesnt exist, then DROP ITHow do i do thisI am open to doing this in ActiveX Script(vbscript) and ExecSQL taskAlso i do not have excel dll or runtime in my dbserver.Please let me knowthanksRS
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Nov 9, 2006
Given a connection string, I can create a database using a SqlCeEngine object and call engine.CreateDatabase().
However, there doesn't seem to be a way to determine whether a database exists, given a connection string. I would need to interpret the connection string myself and extract the file name to use File.Exists() etc.
There should be SqlCeEngine methods to test whether a database exists, test whether it's accessible, and to delete it, given a connection string.
Cheers, Oli
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Sep 24, 2015
I have a table where I need to delete rows if the member does not exists in the member table. Will the following syntax work ?
Delete T
FROM Event_Temp_Lead_Screen T
left join member M on ( M.MemberID = T.MemberID )
where
T.Gender is NULL
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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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Sep 11, 2015
I have some simple files but they are failing because the delete history task is failing as it is looking for files in a non existent directory.
It is looking for files in C:Program FilesMicrosoft SQL ServerMSSQL10_50.INSTANCEMSSQLLog whereas it should be looking in C:Program FilesMicrosoft SQL ServerMSSQL10_50.MSSQLSERVERMSSQLLog
how I can get this corrected so I can get the Maintenance Plans to run correctly.
I have tried deleting and recreating the Plan but to no avail
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May 19, 2012
I am using Master Data Service for couple of months now. I can load, update, merge and soft delete data in MDS. Occasionally we even have to hard delete data from MDS. If we keep on soft deleting records in a MDS table eventually there will be huge number of soft deleted records. Is there an easy way to hard delete all the soft deleted records from all MDS tables in a specific Model.
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Oct 23, 2004
Hello:
Need some serious help with this one...
Background:
Am working on completing an ORM that can not only handles CRUD actions -- but that can also updates the structure of a table transparently when the class defs change. Reason for this is that I can't get the SQL scripts that would work for updating a software on SqlServer to be portable to other DBMS systems. Doing it by code, rather than SQL batch has a chance of making cross-platform, updateable, software...
Anyway, because it needs to be cross-DBMS capable, the constraints are that the system used must work for the lowest common denominator....ie, a 'recipe' of steps that will work on all DBMS's.
The Problem:
There might be simpler ways to do this with SqlServer (all ears :-) - just in case I can't make it cross platform right now) but, with simplistic DBMS's (SqlLite, etc) there is no way to ALTER table once formed: one has to COPY the Table to a new TMP name, adding a Column in the process, then delete the original, then rename the TMP to the original name.
This appears possible in SqlServer too --...as long as there are no CASCADE operations.
Truncate table doesn't seem to be the solution, nor drop, as they all seem to trigger a Cascade delete in the Foreign Table.
So -- please correct me if I am wrong here -- it appears that the operations would be
along the lines of:
a) Remove the Foreign Key references
b) Copy the table structure, and make a new temp table, adding the column
c) Copy the data over
d) Add the FK relations, that used to be in the first table, to the new table
e) Delete the original
f) Done?
The questions are:
a) How does one alter a table to REMOVE the Foreign Key References part, if it has no 'name'.
b) Anyone know of a good clean way to get, and save these constraints to reapply them to the new table. Hopefully with some cross platform ADO.NET solution? GetSchema etc appears to me to be very dbms dependant?
c) ANY and all tips on things I might run into later that I have not mentioned, are also greatly appreciated.
Thanks!
Sky
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Nov 13, 2006
I am having great difficulty with cascading deletes, delete triggers and referential integrity.
The database is in First Normal Form.
I have some tables that are child tables with two foreign keyes to two different parent tables, for example:
Table A
/
Table B Table C
/
Table D
So if I try to turn on cascading deletes for A/B, A/C, B/D and C/D relationships, I get an error that I cannot have cascading delete because it would create multiple cascade paths. I do understand why this is happening. If I delete a row in Table A, I want it to delete child rows in Table B and table C, and then child rows in table D as well. But if I delete a row in Table C, I want it to delete child rows in Table D, and if I delete a row in Table B, I want it to also delete child rows in Table D.
SQL sees this as cyclical, because if I delete a row in table A, both table B and table C would try to delete their child rows in table D.
Ok, so I thought, no biggie, I'll just use delete triggers. So I created delete triggers that will delete child rows in table B and table C when deleting a row in table A. Then I created triggers in both Table B and Table C that would delete child rows in Table D.
When I try to delete a row in table A, B or C, I get the error "Delete Statement Conflicted with COLUMN REFERENCE". This does not make sense to me, can anyone explain? I have a trigger in place that should be deleting the child rows before it attempts to delete the parent row...isn't that the whole point of delete triggers?????
This is an example of my delete trigger:
CREATE TRIGGER [DeleteA] ON A
FOR DELETE
AS
Delete from B where MeetingID = ID;
Delete from C where MeetingID = ID;
And then Table B and C both have delete triggers to delete child rows in table D. But it never gets to that point, none of the triggers execute because the above error happens first.
So if I then go into the relationships, and deselect the option for "Enforce relationship for INSERTs and UPDATEs" these triggers all work just fine. Only problem is that now I have no referential integrity and I can simply create unrestrained child rows that do not reference actual foreign keys in the parent table.
So the question is, how do I maintain referential integrity and also have the database delete child rows, keeping in mind that the cascading deletes will not work because of the multiple cascade paths (which are certainly required).
Hope this makes sense...
Thanks,
Josh
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Nov 17, 2006
I'm trying to clean up a database design and I'm in a situation to where two tables need a FK but since it didn't exist before there are orphaned records.
Tables are:
Brokers and it's PK is BID
The 2nd table is Broker_Rates which also has a BID table.
I'm trying to figure out a t-sql statement that will parse through all the recrods in the Broker_Rates table and delete the record if there isn't a match for the BID record in the brokers table.
I know this isn't correct syntax but should hopefully clear up what I'm asking
DELETE FROM Broker_Rates
WHERE (Broker_Rates.BID <> Broker.BID)
Thanks
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Nov 26, 2007
this is my Delete Query NO 1
alter table ZT_Master disable trigger All
Delete ZT_Master WHERE TDateTime> = DATEADD(month,DATEDIFF(month,0,getdate())-(select Keepmonths from ZT_KeepMonths where id =1),0) AND TDateTime< DATEADD(month,DATEDIFF(month,0,getdate()),0)
alter table ZT_Master enable trigger All
I have troble in Delete Query No 2
here is a select statemnt , I need to delete them
select d.* from ZT_Master m, ZT_Detail d where (m.Prikey=d.MasterKey) And m.TDateTime> = DATEADD(month,DATEDIFF(month,0,getdate())-(select Keepmonths from ZT_KeepMonths where id =1),0) AND m.TDateTime< DATEADD(month,DATEDIFF(month,0,getdate()),0)
I tried modified it as below
delete d.* from ZT_Master m, ZT_Detail d where (m.Prikey=d.MasterKey) And m.TDateTime> = DATEADD(month,DATEDIFF(month,0,getdate())-(select Keepmonths from ZT_KeepMonths where id =1),0) AND m.TDateTime< DATEADD(month,DATEDIFF(month,0,getdate()),0)
but this doesn't works..
can you please help?
and can I combine these 2 SQL Query into one Sql Query? thank you
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Feb 16, 2008
I'm using SqlDataSource and an Access database. Let's say I got two tables:user: userID, usernamemessage: userID, messagetextLet's say a user can register on my website, and leave several messages there. I have an admin page where I can select a user and delete all of his messages just by clicking one button.What would be the best (and easiest) way to make this?Here's my suggestion:I have made a "delete query" (with userID as parameter) in MS Access. It deletes all messages of a user when I type in the userID and click ok.Would it be possible to do this on my ASP.net page? If yes, what would the script look like?(yes, it is a newbie question)
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Sep 16, 2013
The requirement is: I should allow single row delete from a table but not bulk delete. An audit table should get updated if there is any single delete or single update. So I wrote the triggers as follows: for single and bulk delete
ALTER TRIGGER [dbo].[TRG_Delete_Bulk_tbl_attendance]
ON [dbo].[tbl_attendance]
AFTER DELETE
AS
[code]...
When I try to run the website, the database error I am getting is:Transaction count after EXECUTE indicates that a COMMIT or ROLLBACK TRANSACTION statement is missing. Previous count = 0, current count = 1.
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Aug 20, 2007
I ran the following query in Query Analyzer on a machine running SQL Server 2000. I'm attempting to delete from a linked server running SQL Server 2005:
DELETE FROM sql2005.production.dbo.products
WHERE vendor='Foo'
AND productId NOT IN
(
SELECT productId FROM sql2000.staging.dbo.fooProductList
)
The status message (and @@ROWCOUNT) told me 8 rows were affected, but nothing was actually deleted; when I ran a SELECT with the same criteria as the DELETE, all 8 rows are still there. So, once more I tried the DELETE command. This time it told me 7 rows were affected; when I ran the SELECT again, 5 of the rows were still there. Finally, after running this exact same DELETE query 5 times, I was able to remove all 8 rows. Each time it would tell me that a different number of rows had been deleted, and in no case was that number accurate.
I've never seen anything like this before. Neither of the tables involved were undergoing any other changes. There's no replication going on, or anything else that should introduce any delays. And I run queries like this all day, involving every thinkable combination of 2000 and 2005 servers, that don't give me any trouble.
Does anyone have suggestions on what might cause this sort of behavior?
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Nov 20, 2007
Hi,
I have a problem with one report on my server. A user has requested that I exclude him from receiving a timed email subscription to several reports. I was able to amend all the subscriptions except one. When I try to remove his email address from the subscription I receive this error:
An internal error occurred on the report server. See the error log for more details. (rsInternalError) Get Online Help
For more information about this error navigate to the report server on the local server machine, or enable remote errors
Online no help couldn't offer any advice at all, so I thought I'd just delete the subscription and recreate it again, but I receive the same message. "Okay, no problem, I'll just delete the report and redeploy it and set up the subscription so all the other users aren't affected", says I. "Oh, no!", says the report server, and then it give me this message:
System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.Data.SqlClient.SqlException: Only members of sysadmin role are allowed to update or delete jobs owned by a different login. at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async) at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result) at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(DbAsyncResult result, String methodName, Boolean sendToPipe) at System.Data.SqlClient.SqlCommand.ExecuteNonQuery() at Microsoft.ReportingServices.Library.InstrumentedSqlCommand.ExecuteNonQuery() at Microsoft.ReportingServices.Library.DBInterface.DeleteObject(String objectName) at Microsoft.ReportingServices.Library.RSService._DeleteItem(String item) at Microsoft.ReportingServices.Library.RSService.ExecuteBatch(Guid batchId) at Microsoft.ReportingServices.WebServer.ReportingService2005.ExecuteBatch() --- End of inner exception stack trace ---
What's even weirder is that I'm the owner and creator of the report and I'm a system admin and content manager on the report server and I set up the subscription when the report was initially deployed. Surely I should have sufficient rights to fart around with this subscription/report as I see fit?
I have rebooted the server, redeployed the report, checked credentials on the data source and tried amending and deleting from both the report manager and management studio but still I am prevented from doing so.
Any help would be much appreciated.
Thanks in advance,
Paul
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Feb 23, 2006
First, this is not my code.
This one is weird and I am missing something fundamental on this one. A developer was getting a timeout with this...
CREATE PROCEDURE p_CM_DeleteBatch
(
@SubmitterTranID VARCHAR(50)
)
AS
DECLARE
@COUNT INT,
@COMMIT INT
SET @COUNT = 0
SET @COMMIT = 1 --DO NOT CHANGE THIS. The Operation will be commited only when this value is 1
select @COUNT = COUNT(*) from claimsreceived
where (claimstatus NOT IN ('Keyed', 'Imported')) AND
SubmitterTranID = @SubmitterTranID
IF (@COUNT = 0) --This means that that Claims under this Batch have not been adjudicated & it is safe to delete
BEGIN
BEGIN TRANSACTION
DELETE FROM INVOICECLAIMMAPPING WHERE CLMRECDID IN (SELECT DISTINCT CLMRECDID FROM CLAIMSRECEIVED WHERE SUBMITTERTRANID = @SUBMITTERTRANID)
IF (@@ERROR <> 0)
SET @COMMIT = 0
DELETE FROM ClaimsPayment WHERE SubmitterTranID = @SubmitterTranID
IF (@@ERROR <> 0)
SET @COMMIT = 0
DELETE FROM ClaimsPaymentServices WHERE SubmitterTranID = @SubmitterTranID
IF (@@ERROR <> 0)
SET @COMMIT = 0
DELETE FROM ClaimsreceivedPayorServices where ClmRecdPyID in (SELECT ClmRecdPyID
FROM ClaimsReceivedPayors
WHERE SubmitterTranID = @SubmitterTranID)
IF (@@ERROR <> 0)
SET @COMMIT = 0
DELETE FROM ClaimsReceivedPayors WHERE ClmRecdid in (SELECT ClmRecdID
FROM ClaimsReceived
WHERE SubmitterTranID = @SubmitterTranID)
IF (@@ERROR <> 0)
SET @COMMIT = 0
DELETE FROM ClaimsReceivedServices WHERE SubmitterTranID = @SubmitterTranID
IF (@@ERROR <> 0)
SET @COMMIT = 0
DELETE FROM ClaimsReceived WHERE SubmitterTranID = @SubmitterTranID
IF (@@ERROR <> 0)
SET @COMMIT = 0
DELETE FROM BATCHLOGCLAIMS WHERE SubmitterTranID = @SubmitterTranID
IF (@@ERROR <> 0)
SET @COMMIT = 0
IF (@COMMIT = 1)
BEGIN
--ROLLBACK TRANSACTION --For Testing Purpose ONLY
COMMIT TRANSACTION
RETURN (0)
END
ELSE
BEGIN
ROLLBACK TRANSACTION
RETURN (-1)
END
END
ELSE
BEGIN
RaisError ('This Batch cannot be deleted. It has claim(s) which has been Adjudicated', 16, 1)
END
GO
I applied a couple of indices and got ride of the uncorrelated subqueries
CREATE PROCEDURE p_CM_DeleteBatch
(
@SubmitterTranID VARCHAR(50)
)
AS
DECLARE
@COUNT INT,
@COMMIT INT
SET @COUNT = 0
SET @COMMIT = 1 --DO NOT CHANGE THIS. The Operation will be commited only when this value is 1
select @COUNT = COUNT(*) from claimsreceived
where (claimstatus NOT IN ('Keyed', 'Imported')) AND
SubmitterTranID = @SubmitterTranID
IF (@COUNT = 0) --This means that that Claims under this Batch have not been adjudicated & it is safe to delete
BEGIN
BEGIN TRANSACTION
DELETE INVOICECLAIMMAPPING
FROM INVOICECLAIMMAPPING
JOIN CLAIMSRECEIVED
ON INVOICECLAIMMAPPING.CLMRECDID = CLAIMSRECEIVED.CLMRECDID
WHERE CLAIMSRECEIVED.SUBMITTERTRANID = @SUBMITTERTRANID
IF (@@ERROR <> 0)
SET @COMMIT = 0
DELETE FROM ClaimsPayment
WHERE SubmitterTranID = @SubmitterTranID
IF (@@ERROR <> 0)
SET @COMMIT = 0
DELETE FROM ClaimsPaymentServices WHERE SubmitterTranID = @SubmitterTranID
IF (@@ERROR <> 0)
SET @COMMIT = 0
DELETE ClaimsreceivedPayorServices
FROM ClaimsreceivedPayorServices
JOIN ClaimsReceivedPayors
ON ClaimsreceivedPayorServices.ClmRecdPyID = ClaimsReceivedPayors.ClmRecPyID
WHERE ClaimsReceivedPayors.SubmitterTranID = @SubmitterTranID
IF (@@ERROR <> 0)
SET @COMMIT = 0
DELETE ClaimsReceivedPayors
FROM ClaimsReceivedPayors
JOIN ClaimsReceived
ON ClaimsReceivedPayors.ClmRecdid = ClaimsReceived.ClmRecdid
WHERE ClaimsReceived.SubmitterTranID = @SubmitterTranID
IF (@@ERROR <> 0)
SET @COMMIT = 0
DELETE FROM ClaimsReceivedServices WHERE SubmitterTranID = @SubmitterTranID
IF (@@ERROR <> 0)
SET @COMMIT = 0
DELETE FROM ClaimsReceived WHERE SubmitterTranID = @SubmitterTranID
IF (@@ERROR <> 0)
SET @COMMIT = 0
DELETE FROM BATCHLOGCLAIMS WHERE SubmitterTranID = @SubmitterTranID
IF (@@ERROR <> 0)
SET @COMMIT = 0
IF (@COMMIT = 1)
BEGIN
--ROLLBACK TRANSACTION --For Testing Purpose ONLY
COMMIT TRANSACTION
RETURN (0)
END
ELSE
BEGIN
ROLLBACK TRANSACTION
RETURN (-1)
END
END
ELSE
BEGIN
RaisError ('This Batch cannot be deleted. It has claim(s) which has been Adjudicated', 16, 1)
END
GO
SET QUOTED_IDENTIFIER OFF
GO
SET ANSI_NULLS ON
GO
Suddenly this constraint was being violated with the change
ALTER TABLE [dbo].[ClaimsReceivedPayorServices] ADD CONSTRAINT [FK_ClaimsReceivedPayorServices_CLAIMSRECEIVEDPAYOR S] FOREIGN KEY
(
[ClmRecdPyID]
) REFERENCES [CLAIMSRECEIVEDPAYORS] (
[CLMRECPYID]
)
Is the delete on ClaimsReceivedPayors starting before the delete on ClaimsreceivedPayorServices finishes? If so why would it matter between the join and subquery? This one is making me depressed because I can not explain it.
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Apr 3, 2008
Hi all
Need some advice solving a little problem I have with my database!
Current setup:
I have a person table that is made up of 39 columns. I also allow for person records to be deleted but I do this by having another table I call LogicallyDeletedrecords. This table is made up of the PersonId, Reason for deletion/suppression and a date time stamp. To access Live records I created a view based on my Person table which contains a WHERE clause to exclude records that exist in the LogicallyDeletedrecords. Similarly, I have another view DeadPersonData which contains Person records that have been removed. Hope it all makes sense so far! Now on to my worries!
The problem:
My Person table contains 9+ million records. The LogicallyDeletedrecords table has 500k+ but I anticipate further growth over the coming weeks/months. My worry is that my LivePersonData view will be too slow to access as my LogicallyDeletedrecords table grows. What’s more, as part of my Load routine, I have to make sure that Person data loaded on to the system is excluded if that same person exists as a deleted member. Both of these actions could slow down my system as the deleted table grows.
My thoughts:
I’ve been thinking of physically deleting dead Person records from my person table (possibly creating an archive table to hold them). But then if I delete them how do I cross check the details when new Person details get loaded?! As I said, my current LogicallyDeletedrecords table holds the PersonId, ReasonDeleted and CreationStamp. The only way is to add further columns which I use to match Person Details?
Any design suggestions would be welcome!
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Aug 12, 2007
I am trying to write one sql statement that deletes from two tables. Is it possible ? If yes, any thoughts ?
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Feb 1, 2007
Hi seniors
there are two tables involve in replication let say table1 and replicated table is also rep.table1.
we are not deleting records physically in table1 so only a bit in table1 has true when u want to delete a record but the strange thing is that replication agaent report that this is hard delete operation on table1 so download and report hard delete operation and delete the record in replicated table which is very crucial.
plz let me know where am i wrong and how i put it into right way.
there is no triggers on published tables and noother trigger is created on published table.
regards
Ahmad Drshen
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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:
Dim connectionString As String = "Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|PensionDistrict4.mdf;Integrated Security=True;User Instance=True"
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()
Dim sqlExists As String = "IF EXISTS (SELECT * FROM PensionDistrict4 WHERE name = '" + titleString + "Comments" + "')"
Dim sqlCommand As New SqlCommand(newTable, sqlConnection)
If sqlExists = True Then
sqlCommand.Cancel()
Else
sqlCommand.ExecuteNonQuery()
sqlConnection.Close()
End If
I keep getting a "Input String was incorrect format" for sqlExists? I am new to Transact-SQL statements, any help would be appreciated.
Thanks Matt
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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'.
My other table Instructors has 3 fields InstructorName, LastName, FirstName.
I am grabbing the Instructor field from CourseInformation and breaking up the names and inserting them into my instructors table as follows..
Insert into Instructors(InstructorName, LastName, FirstName)
(Select Distinct
ltrim(SUBSTRING(Instructor,CHARINDEX(' ',Instructor)+1,len(Instructor)))+', '+
SUBSTRING(Instructor,1,CHARINDEX(' ',Instructor)-1),
ltrim(SUBSTRING(Instructor,CHARINDEX(' ',Instructor)+1,len(Instructor))) as LName,
SUBSTRING(Instructor,1,CHARINDEX(' ',Instructor)-1) as FNamefrom CourseInformation
where NOT EXISTS(Select * from instructors where LastName = LName and FirstName = FName)
AND Instructor is not null)
Only problem is, I cant get the where not exists clause to work right(of course that wont work what i have cuz the LName and FName columns dont exist, i just did that for demo purposes). I dont want duplicate instructors in there..how can i accomplish this..is there a better way to rewrite my query? Any help is appreciated.
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Feb 7, 2008
HI All,Which is best among the two 1) NOT IN or 2) NOT EXISTS .If the query is Select col1 from tab1 where col2 NOT IN (Select col 3 from tab2 where cl3=0) OR Select col1 from tab1 where col2 NOT EXISTS (Select col 3 from tab2 where cl3=0)
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Oct 12, 2001
Hi,
I have a question on the if not exists. Can you do something like this? If request not exists in table one then insert values into table two?
Thank you in advance,
Anne
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Jul 15, 2004
Hi,
Is there any way to check whether a column is there in the table, if it is there i need to drop it through script.
i'm looking for the script, something like this..
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[FK_Tbl_Product_Tbl_Products]') and OBJECTPROPERTY(id, N'IsForeignKey') = 1)
ALTER TABLE [dbo].[Tbl_Product] DROP CONSTRAINT FK_Tbl_Product_Tbl_Products
GO
In the same way i need to check for a column and drop it through script.
Any help would be greatly appreciated.
Thanks in advance.
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Jun 15, 2007
hi guys! is there anyway to retrieve the row from the result of EXISTS function aside from using the code below?
if EXISTS (select * from rcps_useraccount where User_login = 'daimous')
BEGIN
select * from rcps_useraccount where User_login = 'daimous'
END
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May 16, 2008
Im having a problem with the following can anyone spot how i can fix it? I dont think it likes the begin statement but without it, it has a declare issue.
IF EXISTS (SELECT 1
FROM snapevent.INFORMATION_SCHEMA.TABLES
WHERE TABLE_TYPE='BASE TABLE'
AND TABLE_NAME='FastEp_Snap_OD_Acc' + preports.dbo.f_filedate(getdate())
begin
declare @CMD nvarchar(300)
Set @CMD = 'drop table Snap_OD_Acc_' + preports.dbo.f_filedate(getdate())
--print @CMD
exec (@CMD)
end
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Jun 20, 2008
Hi
Please help me
I have to create a SP.
The secenario is that,
A application calls the SP with a parameter(login), and a string of datas ( Acctid level1 level2; Acctid level1 level2; .......)
UserID AcctID Level1 level2
test testee N Y
the SP have to get the first string of data and check if the Acctid exists or not. If yes then update else insert.Then get then the second string of data and check if the Acctid exists or not. If yes then update else insert.
After checking all the strings ,
it have to check if any Acctids other than acctid mentioned in the string exists in the table for that login, then delete those rows
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Feb 18, 2006
I'm trying to perform an insert query on a table, but I also want to check to see if the record exists already in the table. It should be fairly simple, but I'm having a time of it. Should be something like:
select * from users u
inner join miamiherald m
on u.emailaddress = m.advertiseremail
where not u.emailaddress not exists <<< (???)
If it does exist, I then want to retrieve two columns from it. HELP!!
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May 28, 2007
Hi,
The following works in SQL 2005 but NOT SQL 2005 Compact Edition:
IF EXISTS (SELECT ID FROM Court2 WHERE BookingDate = '2007-05-28')
UPDATE Court2 SET T1100 = 52 WHERE (BookingDate = '2007-05-28')
ELSE
INSERT INTO Court2 (BookingDate,T1100) VALUES ('2007-05-28',52)
In CE I get the following error:
There was an error parsing the query. [ Token line number = 1,Token line offset = 1,Token in error = IF ]
I can't find where the problem is - can someone help.
Thanks,
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Dec 6, 2007
Dear all,
i am trying to improve the performance of stored procedures and functions in that in key word is there i have to replace with exists.which one will give better performance.
Thanks&Regards,
Msrs
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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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Jan 15, 2008
I'm trying to search my table for a url, and if it in the table, increment the number of hits of the url. Here's my code:
tblLinks
-----------------------
URL | NumOfHits
-----------------------
ALTER PROCEDURE sproc_UpdateLink
(
@url varchar
)
AS
IF EXISTS(SELECT LinkURL
FROM tblLinks
WHERE @url = LinkURL)
BEGIN
UPDATE tblLinks
SET NumOfHits = NumOfHits + 1
WHERE @url = LinkURL
END
RETURN
I've also tried:
ALTER PROCEDURE sproc_UpdateLink
(
@url varchar
)
AS
IF (SELECT LinkURL
FROM tblLinks
WHERE @url = LinkURL) IS NOT NULL
BEGIN
UPDATE tblLinks
SET NumOfHits = NumOfHits + 1
WHERE @url = LinkURL
END
RETURN
but that didn't work either.
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Mar 20, 2008
There's an error in this SQL statement somewhere, but I can't seem to find it. Here's what I'm trying to do:
I have a list of states, and each state is assigned an ID
For each state, I have some data
Given a state name, find the state's ID
If the state ID exists, output the data for that state
If the state ID is not in the database, output the data for all states
Here's my tables:
--------------------------
States
--------------------------
ID | Name
--------------------------
--------------------------
Data
--------------------------
StateID | StateData
--------------------------
Here's my SQL:
ALTER PROCEDURE sproc_GetStateData
(
@State varchar
)
AS
DECLARE @StateID int
IF EXISTS(SELECT @StateID = ID FROM States WHERE Name = @State)
BEGIN
SELECT D.StateData
FROM Data AS D INNER JOIN States AS S
ON D.StateID = S.ID
WHERE (D.StateID = @StateID)
END
ELSE
SELECT D.StateData
FROM Data AS D INNER JOIN States AS S
ON D.StateID = S.ID
RETURN
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