Prevent Duplication On UPDATE
Apr 15, 2007
Hello
I noticed a spelling mistake in the data in a column of several tables, I used the following syntax to alter the spelling:
UPDATE [dbo].[Prod_Cat]
SET [ProdName]=N'merseyside'
WHERE ProdName = 'mmserseyside'
The above code correctly updated the spelling error, but it also inserted a new row with the corrected data.
So I found myself with two Identical rows containing the corrected information. I had to manually delete the extra row. Because if I had put in a DELETE statement, I would have then lost both rows.
What do I need to do to prevent this happening next time. As I find that I need to update the names of some products, but I don't want to duplicate them.
Thanks
Lynn
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Jul 10, 2013
Is it possible to create a trigger to prevent update of a row if no signifiant colums are updated
Example : I need to allow the update only if colums a,b or c have changes ?
how it should works to keep or discard the update according to condition ?
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Jul 23, 2005
Hi all!Are there any other way than using rights or Triggers to prevent aDELETE or an UPDATE on a specific column.The "problem" with rights is that they dont apply to all DB-usersThe "problem" with triggers is that they generate lots of extraSQL-codeI would like a solution something like below. If there are anyprimitives like this or other more neat solutions I would be glad toknowCREATE TABLE some_table NO DELETE/* ^^^^^^^^^*/(some_column SOME_TYPE NO UPDATE/* ^^^^^^^^^*/)For clarity, here is a trigger that currently solves the problemCREATE TRIGGER check_updateable_columns ON some_tableFOR UPDATEASIF UPDATE(some_column)RAISERROR(...)GOorCREATE TRIGGER delete_not_allowed ON some_tableINSTEAD OF DELETEASRAISERROR(...)GO
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Nov 16, 2015
I'm trying to find a way to maintain the data that was UPDATEd in a table from being overwritten.
I used UPDATE in a table to include missing data. However, since I do not have access to the original table from where the data is derived, when I run my query, it knocks out the data in my table that was updated, because it is linked to the orginal table that has the blank fields. A few users do not have an employee email, and this has to be updated with a personal email account for now. Â
My update works fine, but is there a way I can use the statement in my query so that it updates each time it is run to maintain the user email address? This will solve the problem of not having to change the original table that I do not have access to.
if exists (select * test..dbo.Employee)
truncate TABLE
 test.. dbo.Employee
insert into test.. dbo.Employee (EmployeeNumber Â
   , EmplUsername Â
[Code] ....
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Apr 15, 2008
Hi,
I've got a table containing calculated values, so i created a field named "archived" (bit datatype) on this table, to prevent the values to be updated if this field is set to true.
Is it possible to created a constraint, to prevent the row to be updated if ARCHIVED=true ? How can i do it ?
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Dec 9, 2004
How can I achieve the following...
I have a Membership No. field which comes from a bookings table, so multiple membership no. do exist. What I want to achieve is a list of membership No.s with no duplication. Sorry to be so dumb, but we all have to start somewhere.
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Nov 14, 2007
i have taple translatio witch have theses coloumn
ID,TypeID,Status,ComID,RecordID,Translator
in this table we assign a certain company with a certain typeID to a certain translator .
so next time when the translator log he goes to the company that he assigned to it when he log to the company page,
there is another company page n arabic that is transalted by the translators , in the arabic page there is a button when you can send this company to transaltion.
but a duplicate have been happen made because user send the same documnet to the translation table so many time so translator transalte the same company profile more than one time witch is not good.
we handle the duplicate of the send to translation button put still there is duplicate record in the database witch is more taht 3000 record
how ican to remove thsi record from the DB without make ant other erroe
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Feb 20, 2008
HI
I have created a job to run a reporting services job which then named it in the job scheduler 354EEF12-404F-46BD-B54F-708B5027837F. I then renamed the job to Rpt ETL log.
However it I was surpised to see two emails come with reference to this report. It seems to have created another one with the long job names.
Is there any way to stop this as I would really like to name to schduled rpt jobs without it duplicating.
Many Thanks
Robert
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May 20, 2002
Hello,
I have a table which consists of 27,000 of records. Among these records, there is one record which
is a duplication of another record.
Is there any way to track this record from the same table by the SQL statement ?
I have been advised to use the following statement but it does not help:
Select count(*) As Duplicate, columnname from tablename group by columnname
Scrolling 27,000 lines of records with bare eyes is very painful.
Any help is appreciated.
Cheers
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Sep 21, 2006
Hi
I have a set of excel files that i need to export to sql2005 using ssis. Now the issue is that i have no idea about he data ie it may have duplication in the primary key column. If i export it as it is to sql server, it will cause me problems. Is there any way i can filter out the rows which have duplication in the primary key column?
Umer
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Aug 19, 2007
Hi, I having a problem with my query...
I want to copy data from 4 different database to 1 database... but if the destination database have already the same Primary Key the copying stops/terminated and not copying others that is not yet in the destination...
I don't have knowledge in T-SQL like IF...ELSE
my database is SQL Server 2000 but i'm using SQL 2005 Express Management for the query...
What i'm doing is like this:
Use osa (Destination Database)
Go
DELETE FROM tblFaculty (*I'll delete first the datas to avoid duplication)
INSERT INTO tblFaculty (FacultyID, LastName, FirstName, MiddleName, Rank, DeptCode)
(SELECT FacultyID, LastName, FirstName, MiddleName, Rank, DeptCode FROM cislucena.dbo.tMasFaculty)
INSERT INTO tblFaculty (FacultyID, LastName, FirstName, MiddleName, Rank, DeptCode)
(SELECT FacultyID, LastName, FirstName, MiddleName, Rank, DeptCode FROM amapn.dbo.tMasFaculty)
INSERT INTO tblFaculty (FacultyID, LastName, FirstName, MiddleName, Rank, DeptCode)
(SELECT FacultyID, LastName, FirstName, MiddleName, Rank, DeptCode FROM abe.dbo.tMasFaculty)
INSERT INTO tblFaculty (FacultyID, LastName, FirstName, MiddleName, Rank, DeptCode)
(SELECT FacultyID, LastName, FirstName, MiddleName, Rank, DeptCode FROM aclc.dbo.tMasFaculty)
My problem is if the facultyID (PrimaryKey) which i'm copying is already on the destination which is osa, the copying stops/terminated regardless whether there is more to copy. On the 4 source database, there might data that other database also has. That's why the copying is terminated. All i want to do is to check first each FacultyID if it is already on the destination before copying it to avoid error or duplication of Primary Key so it won't terminate the copying.
How is this possible sir? Anyone care to help? Thanks in advance! More Power!
Best Regards
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May 5, 2008
Hi All,
Scenario: De-duplication logic should pick one record from source and check with all the destination records and insert if not duplicate. Else raise error. There are average 8 to 10 lookup check for each logic path. Key fields used for de-duplication check are FirstName, LastName, DOB, Gender, SSN.
Issues:
· Since picking row by row and processing the performance is constrained.
· Since 8-10 comparison is done using lookup performance downstream. (Lookup is used without caching, if cashing is used the package is failing after sometimes as if memory is failing. Can we handle this memory problem?)
Please give some suggestion to improve the performance. Current performance is around 2500 records per hour, but there are 8 lac records in total to process.
I am looking for guidance on this issue. If someone can guide me on how to do it better it would help me a lot.
Thanks,
S Suresh
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Apr 1, 2004
I have a table with many fields but there is a single field that I do not want duplicates. If I index this specific field preventing duplicates, the entire record does not append. (The field in question is not keyed).
Thanks
Bill Howard
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Apr 15, 2007
Hello, everyone. I am having problems catching a data duplication issue. I hope I can get an answer in this forum. If not, I would appreciate it if someone can direct me to the right forum.
I am working on a vs2005 app which is connected to a sql2005 db. Precisely, I am working on a registration form. Users go to the registration page, enter the data, ie. name, address, email, etc. and submit to register to the site.
The INSERT query works like a charm. The only problem is that I am trying to reject registrations for which an email address was used. I put a constraint on the email field in the table and now if I try to register using an e-mail address that already exists in the database I get a violation error (only visible on the local machine) on the sql's email field, which is expected.
How can I catch that there is already an email address in the database and stop the execution of the code and possibly show a message to the user to use a different address?
Thank you for all your help.
Antonio
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Mar 7, 2008
I am using Remote Data service to Query an Sql Server Database using MDAC. The Os in which server is loaded in Window 2003 and the MDAC 2.8 version is installed. Now I create a table X with identity column. Then when I try to insert records in that table using Insert into X select * from Y statement. The statement gets executed by when i check the X table I find that the duplicate records are present with different identity no's.
Even when i truncate and retry the same thing occurs.
What could be the reason for the same??
Regards
Pranali.cons
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Nov 17, 2005
We have a large table which is very old and not much ppl take care about, recently there is a performance problem from the report need to query to this table. Eventally we find that this table have primary key missing and there is duplicate data which make "alter table add primary key" don't work
Besides the data size of this table require unacceptable time to execute something like "insert into new_table_with_pk from select distinct * from old table"
Do you have any recommendation of fixing this? As the application run on oracle , sybase and sql server, is that cross database approace will work?
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Sep 15, 2015
When I tried to create a bar chart using SSRS 2012, the vertical axis values are repeating for smaller data sets values. It's only happening when the data labels are below 5, when the data is above 5 this chart represents data fine.
I tried specifying the custom intervals and this option all together eliminated the  bar for value 1, instead it only showed the value 1 as text on the chart.
I tried changing the data interval type as number and the data type is of Integer, these are counts which I am showing in the chart.
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Jan 21, 2007
I am building my first ASP.Net app from scratch and while working on the DAL I came across the problem of SQL Injection. I searched on the web and read different articles but I am still unsure about the answer. My question is should I add
db.AddInParameter(dbCommand, "AvatarImageID", DbType.Int32, avatarImageID);
Add in Parameters to my C# code to avoid SQL Injection. What is the best practice. I am unclear if the stored procedure already helps me avoid SQl Injection or if I need the add in parameters in the C# methods to make it work. I need some help. Thanks, Newbie
My C# update method in the DAL (still working on the code)
private static bool Update(AvatarImageInfo avatarImage)
{
//Invoke a SQL command and return true if the update was successful.
db.ExecuteNonQuery("syl_AvatarImageUpdate",
avatarImage.AvatarImageID,
avatarImage.DateAdded,
avatarImage.ImageName,
avatarImage.ImagePath,
avatarImage.IsApproved);
return true;
}
I am using stored procedures to access the data in the database.
My update stored proc
set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[syl_AvatarImageUpdate]
@AvatarImageID int,
@DateAdded datetime,
@ImageName nvarchar(64),
@ImagePath nvarchar(64),
@IsApproved bit
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
BEGIN TRY
UPDATE [syl_AvatarImages]
SET
[DateAdded] = @DateAdded,
[ImageName] = @ImageName,
[ImagePath] = @ImagePath,
[IsApproved] = @IsApproved
WHERE [AvatarImageID] = @AvatarImageID
RETURN
END TRY
BEGIN CATCH
--Execute LogError SP
EXECUTE [dbo].[syl_LogError];
--Being in a Catch Block indicates failure.
--Force RETURN to -1 for consistency (other return values are generated, such as -6).
RETURN -1
END CATCH
END
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May 21, 2008
Have a job that calls a DTS package, DTS is an Export & Import wizard to copy tables. Someone deleted a table from source and my job failed last night. Inputs appreaciated.
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May 29, 2008
I'm going thru my application log, and just seeing what errors are popping up. I have a relatively intense search feature, thats causing alot of deadlocks.
Exception type: SqlException
Exception message: Transaction (Process ID 105) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction.
In general, what's the best way to resolve this ?
Should I see if I can apply "WITH (NOLOCK)" to my data ?
Any suggestions are greatly appreciated !
thanks again!
mike123
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Nov 22, 2006
Hi
I want to try and protect myself from my own stupidity. I have a number of sql databases, but one is LIVE. It is easy to drop tables but I want to set something (e.g. a password) which will help prevent me from dropping tables on the live database.
Any help/direction here would be appreciated.
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Jul 20, 2005
Hi,I'm using SQL Server 2000 MSDE on a laptop running Windows XP.I have a couple of SP's that that quite some time to compile. So I waswondering: is there any way to have the database *not* recompile them everytime after a reboot?BOL says: "As a database is changed by such actions as adding indexes orchanging data in indexed columns, the original query plans used to accessits tables should be optimized again by recompiling them. This optimizationhappens automatically the first time a stored procedure is run afterMicrosoft® SQL ServerT 2000 is restarted."Now the SQL Server is restarted a lot, because laptops don't have endlessbatteries <g>Cheers,Bas
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Oct 18, 2007
How can I prevent duplicate inserts or entries to a table?
Thank you.
Note: I am using SQL Server and coding ASP.net pages in VB.
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Jan 24, 2004
this is a question I put in the sql community in microsoft, but havent be answered in full
------------
I am using dynamic sql to do a query with differents 'order' sentences and/or 'where' sentences depending on a variable I pass to the sp
ex:
create proc ex
@orden varchar(100)
@criterio varchar(100)
as
declare consulta varchar(4000)
set consulta=N'select pais from paises where '+@criterio' order by '+@orden
------------
I'd like to know it it uses 2 sp in the cache, as I read, the main sp and the query inside the variable of the dynamic sql. if so, as I imagine, then I suppose I have to do the main sp without any 'if' sentence to be the same sp, and so taking it from the cache and not recompile the sp
now, I have various 'if' sentences in the main sp (the caller of the dynamic sql) but I plan to remove them and do the 'if' by program -it is in asp.net-, so I suppose it is better because in this way the main sp is took from the cache, supposing this uses the cache different that the dynamic sql in the variable
what do u think? does the dynamic sql use 2 caches? if so, u think it is better to try to do the main sp same in all uses (no 'if' statements)?
-----
They told me this coding is not good (dynamic sql) because it can give control to the user?
I ask, how does it give control to use? what ar sql injection attack and how to prevent them?
I use dynamis sql because I have 150 queries to do, and thought dynamic sql is good
is it true that dynamic sql have to be recompiled in each execution? I suppose so only if the sql variable is different, right?
can u help me?
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Apr 8, 2004
Hi,
On my site I have a simple textbox which is a keyword search, people type a keyword and then that looks in 3 colums of an SQL database and returns any matches
The code is basic i.e. SELECT * FROM Table WHERE Column1 LIKE %searcg%
There is no validation of what goes into the text box and I am worried about SQL injection, what can I do to minimize the risk
I have just tried the site and put in two single quotes as the search term, this crashed the script so I know I am vunerable.
Can anyone help, perhaps point me in the direction of furthur resources on the subject?
Thanks
Ben
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Jun 10, 2004
I have a web form that I use to insert data into a sql database. I want to know how to prevent inserting duplicate records into the database. Thanks.
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Mar 22, 2006
I want to be able to read and update a value in the database without entering a race condition.
For example:
User #1 reads a row from the database, changes a value then writes the value back.
User #2 reads the same row AFTER user #1 has read it, but BEFORE user #1 writes it back. User #2 then changes the value and writes it back, overwriting the value that user #1 wrote.
I thought I could do this with transactions, but it just makes user #2 wait until user #1 is done writing before user #2 can write. It doesn't stop user #2 from reading while user #1 has it out.
Does that make sense?
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Feb 23, 2001
hi I have a table I need to have a process which prevent a user from entering a name value( company Name ) in a field. how can I do that .
Ahmed
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Jun 20, 2003
Is there a way to monitor all ODBC connections to a MSSQL server and prevent a username/ODBC combination. My problem is that we have many frontends for viewing reports, but we managed them all and users are not allow to make their own connections. Some users now uses MSAccess over ODBC to draw their own reports - they have all the permissions as neededd by the other apps.
thanx
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Aug 21, 2001
Hi all,
I'm writing a trigger to prevent duplicates. I know that this can be done through primary key or unique constraints but in the real world my uniqueness is defined by 8 columns which is too a big an index to maintain on the primary / unique key.
If I create a table with 2 columns
CREATE TABLE Table1
(CentreCHAR(10),
Month CHAR(3)
)
Then create a trigger to prevent duplicates
CREATE TRIGGER trigger_Check_Duplicates
ON Table1
FOR INSERT, UPDATE
AS
-- This trigger has been created to check that duplicate rows are not inserted into AudioVisual table.
DECLARE @IsDuplicate INTEGER
-- Check if row exists
SELECT @IsDuplicate = 1
FROM Inserted i, Table1 t
WHERE t.Centre = i.Centre
AND t.Month = i.Month
IF (@IsDuplicate = 1)
-- Display Error and then Rollback transaction
BEGIN
RAISERROR ('This row already exists in the table', 16, 1)
ROLLBACK TRANSACTION
END
Then insert a row into the new table (no other data is in there)
INSERT Table1
VALUES('0691040176','AUG')
I get the Trigger error message that the row already exists. Why is this the case? I though that Table 1 (target table) would show no entries as it has no data - it should be a before image of the table and the inserted table should be an after image.
Please help!!!
Thanks
Neill
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Jan 13, 2004
Hi,
I have an update tigger on one of my tables.
I want to fire an Update SQL but somehow prevent trigger from firing.
Any Ideas..
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May 18, 2004
I get an issue, that is: Once i expand databases from SQL Enterprise Manager, it takes a long time to wait displaying all names of databases. How should i do to prevent displaying all names of databases?
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May 17, 2008
Hi all
In our office we have simple Network (LAN) and for some reason in each workgroup Computer in this network we have installed SQL-Server 2000.
So far everything was ok but recently i noticed that my co-workers can easily access my Sql Server Instance through their Enterprise manager installed on their computers and then they can open my tables,view...and manipulate other objects.
for better illustration i have created a Flash Movie from this process , please check the following Link :
http://www.Parsisoftco.com/movie/Sql/Sql.htm
How can i prevent others from doing so?
Any help greatly Appreciated.
Kind Regards.
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