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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Filtering Duplicate ID's?

Jul 23, 2005

Hi, all:I'm having trouble with something that probably has a simple solution.I have linking tables that can list a particular MemberID multipletimes. Is there a way to run a query so that a specific ID will showup once?Here is an example of the tables I've set up --MemberTable:==MemberIDMemberName1Dave2John3MichaelFruitTable:==FruitIDFruitName1Apple2Orange3PearVeggieTable:==VeggieIDVeggieName1Carrot2Celery3Potato....and these linking tables --Members2Fruits:==MemberIDFruitID1213223132Members2Veggies:==MemberIDVeggieID1221222331This is the query I'm using to retrieve the ID's:SELECT distinct m.*, m2f.*, m2v.*FROM ((MemberTable m INNER JOIN Members2Fruits m2fON m.MemberID = m2f.MemberID)INNER JOIN Members2Veggies m2v ON m.MemberID = m2v.MemberID)WHERE ...By the way, I know of the GROUP BY clause, but it didn't work for me.Thanks for any help.J

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Filtering On Duplicate Data

May 2, 2008


I have a dataset which I would like to remove data from, but I can't seem to find out how to do this.

The dataset contains the following columns:

SCode, NIn, SIn, AIn, NOut, SOut, AOut and TagNumber.

I would like to remove data from the dataset when the following occurs:

("SC123", "NIn123", "s-in-323", "a-in-342", "NOut43", "s-out-231", "a-out-45", "tagnumber12")
("SC123", "NIn123", "s-in-xyz", "a-in-xws", NULL, NULL, NULL, "tagnumber12")

This is when NIn occurs with the same value more than once, and I would like to remove (or ignore, filter) the row when NOut, SOut and AOut are null.

I am new to SSIS and can't see how I could do this (although I'm sure it's possible).

If anyone could show me how I would appreciate it.


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May 2, 2014

I am new in SQL programming world, following is query that i had created

select interfaces.nodeid as 'Node Id',
nodes.caption as 'Node Name',
netflowsources.Lasttime as NetflowLastTime

from interfaces inner join nodes on interfaces.nodeid = nodes.nodeid
inner join netflowsources on interfaces.interfaceid = netflowsources.interfaceid

where netflowsources.LastTime NOT LIKE GETDATE()

which is from that query i get a return successfully, but i just noticed that, for column nodeid was showed me multiple duplicated records, for example

nodeid value = a,a,a,b,b,c,c,c,c,d,d,d

But what i expected was to get a return without any duplicate record within it. and i also have tried using "distinct" command, but that only impacted on "a" value, but others value not change at all.

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Filtering/Grouping To Remove Duplicate Values...

Oct 18, 2001

There's some SQL below (T-SQL) & I'm wanting to have this result set
grouped by Venue_ID in order to remove rows where there are duplicate values contained in just one column.

The columns BCOM_ID contain unique values, but Venue_ID can have duplicate
values. I only want to get rows for one instance of the Venue_ID (per
BCOM_ID) - doesn't matter which instance but basically, no duplicates.

Oh yes, one of the columns is a Bit column.

Any ideas would be welcome & appreciated!

Many thanks,


SELECT Booking_Header.BH_ID,
Booking_Header.BStat_ID, Booking_Header.BT_ID,
Booking_Header.Tagged, Booking_Header.Status_Timestamp,
Booking_Header.Start_Date, Booking_Header.Days_Qty,
Proposal.PPL_ID, Proposal.PPL_Status,
Booking_Component.Venue_ID, Venue.Venue_Code,
Venue.Description, Address.Address_ID, Address.Town,
FROM dbo.Booking_Header INNER JOIN
dbo.Proposal ON
dbo.Booking_Header.BH_ID = dbo.Proposal.BH_ID INNER JOIN
dbo.Booking_Component ON
dbo.Proposal.PPL_ID = dbo.Booking_Component.PPL_ID INNER
dbo.Venue ON
dbo.Booking_Component.Venue_ID = dbo.Venue.VE_ID INNER JOIN
dbo.Address ON
dbo.Venue.VE_ID = dbo.Address.VE_ID INNER JOIN
dbo.Booking_Status ON
dbo.Booking_Header.BStat_ID = dbo.Booking_Status.BStat_ID INNER
dbo.Booking_Type ON
dbo.Booking_Header.BT_ID = dbo.Booking_Type.BT_ID
WHERE (dbo.Proposal.PPL_Status = 1) AND
(dbo.Booking_Header.BH_ID = 10)


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Filtering Out Duplicate Rows Based On Three Column

Nov 25, 2014

I want to filter out the duplicate rows based on three columns. I got this quick query from Microsoft site to filter out the duplicate rows, but I am getting the result that filters out the non-duplicate one too. Below is the query

;With Temp as (
SELECT row_number() over (partition by [id],[p_date], order by [id],[p_date],) as Row,


In the above case id is null, but in some rows id is not null . The above is obviously not duplicate.

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Feb 7, 2007

In my report I want an optional parameter to filter all records with a specific field that is not blank. I tried several scenario's without result...

In the parameter I want to set a text value like "exampletext".

In the filter I want a check: if the parameter value is "exampletext", only show the records where field "abc" is not blank.

On the tab Filters from the Table properties I can set three values: Expression, Operator and Value.

Please help!

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Apr 22, 2008

Hi All,
Can anybody tell me which of the following is the most efficient query if i have huge tables.

SELECT *FROM Tab1 Inner join Tab2 ON Tab1.Col1 = Tabl2.Col1 AND Tab1.Col1 = 5


SELECT *FROM Tab1 Inner join Tab2 ON Tab1.Col1 = Tabl2.Col1WHERE Tab1.Col1 = 5

As long as i explored this, Sql Server Query Execution Plan shows the similar cost for both cases. Is there any difference?
If yes why?

Thanks in advance.


Sulaman Riaz

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Aug 29, 2006

Hi -- I'm starting an ASP.NET 2.0 application which contains a page with a checkbox and gridview control on it.  In its default state the gridview displays all the records from a table pulled from a SQL Server database (via a SqlDataSource object).  When the user checks the checkbox, I want the gridview to display only the records where one of the columns is not null.  But I've been unable to construct the WHERE clause of the SQLDataSource object correctly.  I see that I can hard-code the SqlDataSource object so that the column to be filtered is always NULL or always NOT NULL. But I want this filtering to be more dynamic such that the decision to show all or non-null records happens at run-time.  Should I be using two SqlDataSource objects -- one for the NOT NULL condition and one for the "all records" condition?  Then when the user checks the checkbox, the gridview would be configured to point to the appropriate SqlDataSource object. (???)  Seems like a bit of overhead with that approach.  I'm hoping there's a more elegant way to get this done.  Please let me know if you need more information.  Thanks in advance. Bill

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Mar 11, 2008

I have created a stored procedure in sql server 2005 which will fetch a particular record based on the value we supply for a column. It is working fine. The same task i need to implement in my web form. I have a textbox in my webform where i will enter the empage which is in the table. Based on the value the record(s) should get displayed in the gridview. How to acheive this. Pls help me with full coding. it is urgent.
Thanx is advance

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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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Jan 27, 2005

Hi All,

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

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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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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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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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Feb 9, 2004


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

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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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Apr 11, 2008

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Apr 6, 2006

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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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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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Apr 27, 2007

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

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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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Sep 3, 2007

hi all,
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i thought of using the comparevalidator but i'm not sure how to proceed.

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Oct 5, 2007

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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


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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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Dec 4, 2000

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Jan 12, 2000


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