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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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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Jun 6, 2007

I have the following Query:
1    declare @StartDate char(8)2    declare @EndDate char(8)3    set @StartDate = '20070601'4    set @EndDate = '20070630'5    SELECT Initials, [Position],  DATEDIFF(mi,[TimeOn],[TimeOff]) AS ProTime6    FROM LogTable WHERE 7    [TimeOn] BETWEEN @StartDate AND @EndDate AND8    [TimeOff] BETWEEN @StartDate AND @EndDate9    ORDER BY [Position],[Initials] ASC
The query returns the following data:
Position                                           Initials ProTime     -------------------------------------------------- -------- ----------- ACAD                                               JJ       127         ACAD                                               JJ       62          ACAD                                               KK       230         ACAD                                               KK       83          ACAD                                               KK       127         ACAD                                               TD       122         ACAD                                               TJ       127        
What I'm having trouble with is the fact that I need to return a results that has the totals for each set of initials for each position.  For Example, the final output that I'm looking to get is the following:
Postition                       Initials                 ProTime
ACAD                           JJ                       189ACAD                          KK                       440ACAD                          TD                        122ACAD                          TJ                         127
 Any assistance greatly appreciated.

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Sep 28, 2006

any idea?

quick query duplicate records (speicifed fields.value are same) using T-SQL?

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Nov 18, 2015

How can I prevent duplicate records in the query

Property AS
FROM dbo.MulkiyetBase
Document AS


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Jul 3, 2007

How do I update a record that has duplicates. For example, I have 3612 orders some of these orders have multiple orderid's I want to update the record for each of these orders that was added most recently.

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T-SQL (SS2K8) :: Query To Avoid Duplicate Records (across Columns)

Jan 3, 2015

rewrite the below two queries (so that i can avoid duplicates) i need to send email to everyone not the dup[right][/right]licated ones)?

Create table #MyPhoneList
AccountID int,
EmailWork varchar(50),
EmailHome varchar(50),
EmailOther varchar(50),

[Code] ....

--> In this table AccountID is uniquee

--> email values could be null or repetetive for work / home / Other (same email can be used more than one columns for accountid)

-- a new column will be created with name as Sourceflag( the value could be work, Home, Other depend on email coming from) then removes duplicates

SELECT AccountID , Email, SourceFlag, ROW_NUMBER() OVER(PARTITION BY AccountID, Email ORDER BY Sourceflag desc) AS ROW
INTO #List
from (
, EmailWorkAS EMAIL
, 'Work'AS SourceFlag
FROM#MyPhoneList (NoLock) eml
WHEREIsOffersToWorkEmail= 1


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SQL Query - Duplicate Records - Different Dates - How To Get Only Latest Information?

Mar 17, 2006

I have a SQL query I need to design to select name and email addressesfor policies that are due and not renewed in a given time period. Theproblem is, the database keeps the information for every renewal inthe history of the policyholder.The information is in 2 tables, policy and customer, which share thecustid data. The polno changes with every renewal Renewals in 2004would be D, 2005 S, and 2006 L. polexpdates for a given customer couldbe 2007-03-21, 2006-03-21, 2005-03-21, and 2004-09-21, with polno of1234 (original policy), 1234D (renewal in 2004), 1234S (renewal in2005), and 1235L (renewed in 2006).The policy is identified in trantype as either 'rwl' for renewal, or'nbs' for new business.The policies would have poleffdates of 2004-03-21 (original 6 monthpolicy) 2004-09-21 (first 6 month renewal) , 2005-03-21 (2nd renewal,1 year), 2006-03-21(3rd renewal, 1 yr).I want ONLY THE LATEST information, and keep getting earlyinformation.My current query structure is:select c.lastname, c.email, p.polno, p.polexpdatefrom policy p, customer cwhere p.polid = c.polidand p.polexpdate between '2006-03-01 and 2006-03-31and p.polno like '1234%s'and p.trantype like 'rwl'and c.email is not nullunionselect c.lastname, c.email, p.polno, p.polexpdatefrom policy p, customer cwhere p.polid = c.polidand p.polexpdate between '2006-03-01 and 2006-03-31and p.polno like '1234%'and p.trantype like 'nbs'and c.email is not nullHow do I make this query give me ONLY the polno 123%, or 123%Sinformation, and not give me the information on policies that ALSOhave 123%L policies, and/ or renewal dates after 2006-03-31?Adding a 'and not polexpdate > 2006-03-31' does not work.I am working with SQL SERVER 2003. Was using SQL Server 7, but foundit was too restrictive, and I had a valid 2003 licence, so I upgraded,and still could not do it (after updating the syntax - things likeusing single quotes instead of double, etc)I keep getting those policies that were due in the stated range andHAVE been renewed as well as those which have not. I need to get onlythose which have NOT been renewed, and I cannot modify the database inany way.*** Free account sponsored by SecureIX.com ****** Encrypt your Internet usage with a free VPN account from http://www.SecureIX.com ***

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SELECT Query Syntax To Display Only The Top Record For Duplicate Records

Oct 6, 2005

Good day!

I just can't figure out how I can display only the top record for the duplicate records in my table.


Code Date
01 10/1/05
01 10/2/05
01 10/3/05
02 9/9/05
02 9/9/05
02 9/10/05

My desired result would be:
Code Date
01 10/1/05
02 9/9/05


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Jun 7, 2014

I'm trying to do some analysis on duplicate records based off of several match keys. I have a data set of approximately 30,000 people and the goal is to determine how many duplicate matches are in the system.

How would I write an SQL statement that looks for the following pieces of information. (I'm not using one person as an example; I need to do an analysis on the entire data set)

First name (exact match)
Last name (exact match)
Address line 1 (exact match)
Postal code/zip (exact match)

First Initial (exact match)
Last name (exact match)
DOB exact match
Postal code/zip (exact match)

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Mar 20, 2014

writing the query for the following, I need to collapse the continuity. If the termdate for an ID is one day less than the effdate of the next id (for the same ID) i need to collapse the records. See below example .....how should i write the query which will give me the desired output. i.e., get min(effdate) and max(termdate) if termdate is one day less than the effdate of next record.

ID effdate termdate
556868 1999-01-01 1999-06-30
556868 1999-07-01 1999-10-31
556869 2002-10-01 2004-01-31
556872 1999-02-01 2000-08-31
556872 2000-11-01 2004-01-31
556872 2004-02-01 2004-02-29

output should be ......

ID effdate termdate
556868 1999-01-01 1999-10-31
556869 2002-10-01 2004-01-31
556872 1999-02-01 2000-08-31
556872 2000-11-01 2004-02-29

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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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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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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

Thanks Alot

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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.

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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

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Sep 27, 2006

Hi,I have written a web application using dreamweaver MX, asp.net, 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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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.
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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.

1----------A-----------A@yahoo.com---------2000-09-05 16:07:00.000
2----------A-----------A@yahoo.com---------2000-09-10 16:07:00.000
3----------A-----------A@yahoo.com---------2000-09-15 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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