Prevent Duplicate Records

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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Transact SQL :: How To Prevent Duplicate Records In Query

Nov 18, 2015

How can I prevent duplicate records in the query

Property AS
FROM dbo.MulkiyetBase
Document AS


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Prevent Duplicate Insert

Oct 18, 2007

How can I prevent duplicate inserts or entries to a table?
Thank you.
Note: I am using SQL Server and coding pages in VB.

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How Can I Prevent From Inserting Duplicate Data?

Dec 31, 2006

I have a table storing only 2 FKs, let's say PID, MID
Is there any way that I can check distinct data before row is added to this table?
For example, current data is
PID MID------------100 2001100 2005101 3002102 1009102 7523102 2449
If my query is about to insert PID 100, MID 2001, since it's existing data, i don't want to add it. Can I use trigger to solve this issue?

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Prevent Duplicate Entries In A Table

Nov 11, 2003

I have an ASP.Net Web appplication with a Back-End SQL DB. There are 3 Tables; Users, Groups, and GroupMember.

The GroupMember table is used to link Users to Groups and consists of just two fields; userID and GroupID.

Here is a sample of some data:

User1 Group1
User1 Group2
User2 Group2
User3 Group1
User3 Group3

Users can belong to multiple Groups. However, you shouldn't be able to have the same user and group comobination more than once. for example:

User1 Group1
User2 Group2
User1 Group1

I can stop this kind of duplicate data entry by doing a lookup first (using to see if the entry already exists but this seems cumbersome.

Is there a simpler way to prevent duplicate entries in a table using sql?

Thanks a lot,


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CHECK Constraint To Prevent A Conditional Duplicate

Jul 23, 2005

Hi,I need to enforce that a table does not have "duplicates" for aspecific status type in the table.If the column "STATUS" = 2, then there can not be more than one rowwith a specific "ID" column.I can not use a unique key constraint because duplicate values for thiscombo of columns is valid for the status = 1.Just when the status = 2, there can not be any other rows with the sameID and status = 2.Any ideas?-Paul

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How To Prevent Ordering Of Records....

Jan 9, 2007


i use VC# and sql server 2005.

i create a table using the following command :

create table history(name varchar(20) primary key);

I insert records in a particular order.After all the records are inserted and when I try to retrieve the records, all of them are sorted in a ascending order.Is there any way to prevent them from being sorted.

pls reply asap.....

- Sweety

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Triggers Prevent Updates To Multiple Records

Mar 13, 2002

I have triggers in place on a table that do various checks on data input. It is clear that because of these triggers I cannot do updates on multiple records in this table. When I do, I receive an error that "subquery returned more than one value." Is there anyway to work around this by temporarily turning off triggers or something else?

Many thanks for advice.

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Duplicate Records

Jan 18, 2000

Is there a way to find duplicate records in a table using code. We have about 500,000 records in this table.

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Duplicate Records

Jan 27, 2005

Hi All,

How to check for the duplicate records in the table? Thanks.

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Duplicate Records

Jun 12, 2002

Yes, I know this subject has been exhausted, but I need help in locating the discussion which took place a few months ago.
Sharon relayed to the group a piece of software (expensive) which would help in my particular situation. I grabbed a demo and have gotten the approval for purchase. Unfortunately, I don't have the thread with me at work.

The problem:

Number Fname Lname Age ID
123 John Franklin 43 1
123 Jane Franklin 40 2
123 Jeff Franklin 12 3
124 Jean Simmons 39 4
125 Gary Bender 37 5
126 Fred Johnson 29 6
126 Fred Johnson 39 7
127 Gene Simmons 47 8

The idea would be to get only unique records from the Number column. I don't care about which information I grab from the other columns, but I must have those fields included.
If my resultant result set looked as follows, that would be fine. Or any other way, as long as all of the fields had information and there were only unique values in the Number field.

Number Fname Lname Age ID
123 Jeff Franklin 12 3
124 Jean Simmons 39 4
125 Gary Bender 37 5
126 Fred Johnson 39 7
127 Gene Simmons 47 8

If anyone remembers this discussion, mainly the date, I would really appreciate it.


Gregory Taylor
MIS Director
Timeshares By Owner

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Duplicate Records

Jul 13, 2007


I have a field called user_no

i want to find out which ones are duplicates in the user_no field

the data in user_no is like this


so there are 10,000 records in the table and i want to find out the duplicate records in them

can someone tell me how my query will be


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Duplicate Records

Feb 17, 2008

I have two tables, one contains all work orders, the second contains records on work orders that are linked to customoer orders. I'm trying to create a query that will return specific fields from the table that contains orders in the linked order table, and only the work orders in the all order table that (work_order) do not exist in the linked order table (demand_supply_link). I have tried several queries and cannot get the results I desire. Here is the query I am currently trying.


SELECT distinct work_order.desired_want_date as 'Want Date', work_order.BASE_id as 'WO Id',
work_order.desired_qty as 'End Qty', work_order.part_id as 'Part Id', operation.resource_id as Resource,
part.description as Description

This is the error I receive:
Server: Msg 205, Level 16, State 1, Line 1
All queries in an SQL statement containing a UNION operator must have an equal number of expressions in their target lists.

The all orders table (work_order) will not have the other fields to link to as there is no customer order linked to them.

Can anyone help. Thanks!

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Duplicate Records

Feb 9, 2004


Can anyone tell me how to stop a SQL query displaying duplicate records within a table

Thanks Alot

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Duplicate Records

Apr 7, 2004

Can someone tell me the best procedure when trying to find duplicate records within a table(s)?

I'm new using SQL server and I have been informed that there maybe some DUPS within unknown tables. I need to find these DUPS.

If someone can tell me how to perform this procedure I would apprciate it. And if you reply can also include examples that i could follow for my records.

Thanks for the help?

-SQL Rookie

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Duplicate Records

Apr 11, 2008

anybody know what sql statement can be used to pull duplicate records from an sql table.

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Duplicate Records

Apr 6, 2006

Table1 has shop# and shop_id. Every shop# should have only one shop_ID. There has been a few data entry errors where a shop# has duplicate a shop_id. How to write a query for shop#s that have more than one shop_id?

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Duplicate Records

Jan 6, 2008

I have a table with phone numbers.

I want to find if any phone number are repeated more then once. How can I accomplish this?

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Duplicate Records

Feb 11, 2007


Not so sure how simple this question is but here is what happened. I installed SQL Server 2005 on a new Win Server 2003. I exported the tables and their data from the old machine to the newly established database on the new machine.

It looks like all my records were duplicated. When I try to delete one of the duplicates it won't work because both rows are effected. I can't set my primary key now and if I try to create a new database with the primary key already set than the import fails.

Any one run into this before or know what's going on?

Any help ASAP would really be appreciated.



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Duplicate Records

Apr 27, 2007

how to we check in for duplicate records without using sort (remove duplicateS)

i need to remove duplicates based on four columns.

please let me know

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Records Duplicate When Edited...?

Sep 27, 2006

Hi,I have written a web application using dreamweaver MX,, and MSsql server 2005.The problem I am having occurs when I attempt to edit a record. I have setup a datagrid with freeform fields so that the user can click on edit, make the required changes within the data grid then click update. The data is then saved to the database. All this was created using dreameaver and most of the code was automatically generated for me.The problem is that, not everytime, but sometimes when I go to edit a record once I hit the update button to save the changes the record is duplicated 1 or more times. This doesnt happen everytime but when it does it duplicates the record between 1 and about 5 times. I have double checked everything but cannot find anything obvious that may be causing this issue. Does anyone have any suggestions as to what I should look for? Is this a coding error or something wrong with MSsql? Any ideas?Thanks in advance-Mitch 

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Duplicate Records On Database

Sep 3, 2007

hi all,
How do i avoid duplicate records on my database? i have 4 textboxes that collect user information and this information is saved in the database. when a user fills the textboxes and clicks the submit button, i want to check through the database if the exact records exist in the database before the data is saved. if the user is registered on the database, he wont be allowed to login. how can i acheive this?
i thought of using the comparevalidator but i'm not sure how to proceed.

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Duplicate Records In A Table

Oct 5, 2007

How do i remove duplicate records from a table with a single query without using cursors or anything like that.Sample :tempCol11221P.S The table has only one column  

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Delete Duplicate Records

Jul 30, 2004

I use a tabel for storin log data from a mail server. I noticed that I'm getting duplicate records, is there a way to delete the socond and/or third entry so I dont have any duplicates?

I need this done in SP.

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Returning The Last Row From A Set Of Duplicate Records

Feb 27, 2002

Any information as to how to handle this?


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Filtering Duplicate Records

Jul 3, 2001


I am trying to fetch data from 2 tables, say TABLE1 and TABLE2, both of which got columns like id and num. Then i want all the rows from TABLE1 where id1=id2 and num1 != num2.
but it is showing all the rows for an id1 twice, if there are two records in TABLE2 with same id and num.
is there any way to filter those records without using the distinct keyword.


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Duplicate Records Query

Jul 9, 2001

Can anyone help me to write a query to show customers who have duplicate accounts with Email address, first name, and last name. this is the table structure is Customer table


Records will be

like this

customerid accountno fname lastname
1 2 lori taylor
2 2 lori taylor
3 1 randy dave


emailid (PK)

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Delete Duplicate Records

Oct 19, 2000

Sorry for the new thread.

I have a userprofile table. There are a lot of duplicate records in this table. e.g.

---------------------------------------------------------------------- 16:07:00.000 16:07:00.000 16:07:00.000

Userid is auto number, lastname and emailaddress are PK.

I want to delete duplicate records. If lastname and emailaddress are the same, only keep a record which createdate is the most newest date. See above example I only want to the record which userid is 3. I have alreday created a code which I attached below. This code onle keep a record which userid is 1.

Anybody can help me to solve this problem? Thanks.

============== My current code ====================
delete from userprofile where userprofile.userid in
--list all rows that have duplicates
(select p.userid
from userprofile as p
where exists
(select lastname, emailaddress
from userprofile
where lastname = p.lastname and emailaddress = p.emailaddress
group by lastname, emailaddress
having count (userid)>1))
and userprofile.userid not in
--list on row from each set of duplicate
(select min(p.userid)
from userprofile as p
where exists
(select lastname, emailaddress
from userprofile
where lastname = p.lastname and emailaddress = p.emailaddress
group by lastname, emailaddress
having count (userid)>1)
group by lastname, emailaddress)

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Search Duplicate Records

Dec 4, 2000

Just like Unique/Distinct command, is these some way I could list just the duplicate records from a table . The field is numeric.
Thanks a lot for you help.

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Find Duplicate Records

Jan 12, 2000


Does anybody know the SQL query to find the duplicate records?

Many Thanks in advance!

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Query To See Only Duplicate Records

Dec 16, 1999

How can I made a query to show only my duplicate records ?
For some reason that i do not know, i have duplicate entries in my clustered index 21 duplicate records in a table how can i query to know those 21 duplicate records ?


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How To Find Duplicate Records

Feb 4, 2003

Hello board,

I was wondering if anyone can tell me an easy way to find duplicate records on sql. The thing is this, at work we have a database (table) which includes tracking numbers, I need a easy way to be able to search this table for duplicate tracking numbers and print them out. I currently access this table to edit some data by using the following path “Start > Programs > Microsoft SQL Server > Enterprise Manager” then work my down the tree to “Databases > Master > Tables” on tables I do a right click and “open table/query”. Any help would be most appreciated. Believe me I’m very “SQL illiterate”


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Deleting Duplicate Records.

Jul 8, 1999

I need a sql statement to delete duplicate records.

I have a college table with all colleges in the nation.
I noticed that all of the colleges were listed twice.
How do I delete all of the duplicate records.

Here is my table.
schoolID - smallint NOT NULL,
schoolName - varchar(60) NULL

Can someone help me out with the sql statement???
I'm running SQL Server 6.5.

- ted

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