Queries :: Delete Duplicates Retain Unique Records
Aug 13, 2013
I have a table that has multiple records (count >1). I used the find duplicate records and then made it a delete query, however, this resulted in deleting all the records that had count >1. I need to retain distinct record, and delete the extra records. Using select distinct.. I do not want to use VBA to achieve this, but at the same time be able to incorporate the steps in a module that would execute the queries in a sequential order and achieve the same results.
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Feb 27, 2014
I have imported a large number of emails into a table tbl_requests.
I had intended to have unique file tbl_requests.date_opened unique, but have ended up with a lot of duplicate records (i.e. tbl_requests.date_opened is not unique !). How to delete any duplicates? I have 15,000 records...
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Aug 4, 2015
I have a unique query which lists all the films that we are screening over the next 3 months. I have added a COUNT field so that I can see how many of each films we are screening.
The problem is that i get duplicates of some films - and this may be because we may hold several copies of some films. I have attached two images which might explain this better!
What I could do with is knowing how to make it so that i get a list of films booked and how many of each, regardless of which copy of the film is used.
The SQL is:
Code:
SELECT DISTINCTROW dbo_Films.[film name], Count(dbo_Films.[film name]) AS [CountOffilm name]
FROM ((dbo_Films INNER JOIN dbo_filmCopies ON dbo_Films.ID = dbo_filmCopies.tblFilms_ID) INNER JOIN dbo_EventsFlicks ON dbo_filmCopies.ID = dbo_EventsFlicks.filmCopyID) INNER JOIN dbo_Venues ON dbo_EventsFlicks.venueID = dbo_Venues.ID
WHERE (((dbo_EventsFlicks.datefield)>=#8/1/2015# And (dbo_EventsFlicks.datefield)<#1/1/2016#))
GROUP BY dbo_Films.[film name], dbo_Venues.southhub, dbo_Venues.northhub, dbo_Films.Specilaised
ORDER BY dbo_Films.[film name];
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Sep 11, 2013
I'm attempting to create an append query that will add new records only if there isn't an equivalent record already existing. Typically I would add the existing table to the query, and only add new records if the same do not exist. In this case, the table is maintaining records over time (start date and end date).
I have 4 tables:
[t_employees]
employee_ID
employee_name
[t_cities]
city_ID
citiy_name
[t_city_assignment]
city_assignment_ID
start_date
end_date
employee_ID
city_ID
[t_temp_employees]
effective_date
employee_ID
city_ID
I'm checking if [t_temp_employees].[effective_date] <> [t_city_assignment].[start_date]. However, if the employee has historical entries it will still add a record (in fact, it'll add multiple records).
How can I append a new record only if one for the same time period does not exist?
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May 17, 2013
I have duplicate data in a cell, I want to hide duplicate data and display only non-duplicate data.. I changed the property sheet to only show unique values, but it keeps showing data I don't want to see...
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Nov 2, 2014
I have a client database that has recently had multiple duplicate entries. I need to reduce or negate this erroneous activity. I have a client table where I record amongst others, the following;
key
[christian_name]
[family_name]
[dob]
......
I believe that to prevent duplicate entrie via form I have created an additional field called "unique" given it as a unique index which I want to have populated with the joined fields first_name & last_name & dob (IE johndoe01/01/90), and then as user enters a new client it wont allow a duplicate.
However I need to fill all the existing customers (3600+) with the relevant joined existing data. If I create an expression I can cajoin the fields in a select query but when I try to make an update query the same syntax comes up with empty fields.
select query sql that worked to show field ...
SELECT divers.christian_name, divers.family_name, divers.dob, [christian_name] & [family_name] & [dob] AS Expr1
FROM divers;
update query that was empty ..
UPDATE divers SET divers.[unique] = [christian_name] & [family_name] & [dob];
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Feb 10, 2014
I need to delete duplicate rows (or create new table without them) but the duplicate is not the entire row of data.
Date Time LeagueMatchingId League HomeMatchingId HomeName AwayMatchingId AwayName
HomeScore AwayScore HomeRedCardCount AwayRedCardCount FTOU FTOverOdds FTUnderOdds
20121202 10/02/2014 20:34:02 17 FRANCE LIGUE 1 147 Lorient 154 Toulouse 0 0 0 0 1.5 0.88 -0.98
20121202 10/02/2014 20:34:02 17 FRANCE LIGUE 1 147 Lorient 154 Toulouse 0 0 0 0 1.5 0.88 -0.98
[Code] .....
In this example I am only interested in the first and last rows, since the ones in between have the same data in the last few columns. They are not true duplicates since the time stamp for each is different.
Currently thinking I need to compare each and every row to the prior row in VBA and delete if criteria match.
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Mar 3, 2006
My database was working fine until I had to make some minor changes in a few of the fields (which I did in the table and the data entry form). Now, all of the combo boxes in all of the records show the same selection. If I change the selection in one of the fields in a record, it changes the selection in that field in all of the records to that selection. :eek:
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Nov 26, 2007
I have this scenerio that I am trying to work through and find a proper solution:
Main table stores a part # and an index (Primary Key) along with a bunch of other data. I want to store with the part # the current active version of firmware (aka software) associated with that particular part# / index. Part # may be a duplicate, so for this reason the PK is the index, so that each index / part # will have which firmware has been used with it.
I would like the ability to retain a history of firmware versions used for a particular part # / index so that if we need to go back to a previous version of software we will know which ones have been used.
I have been able to create the relationship to show all previous versions of the firmware used for a particular part # / index, but cannot figure out how to only have one 'current' and update the others as 'archived'. I would like to either use a boolean or selectable lookup (ie Current vs. Archived). What I want is that when I select one firmware to be ‘current’ all others related to the particular part # / index are updated to ‘archived’ leaving the other records not related to that part # / index alone. Also note that I am trying to make the update of the firmware status in the table view without having to go through a form.
Main Table
ID (PK)
Part No
Product
Firmware History
FirmwareVerIndex (PK)
PartNo
Firmware
ChangeDate
ChangeName
FirmwareStatus
Firmware Table (lookup table)
FirmwareIndex (PK)
Firmware
FirmwareFileName
FirmwareStatus (lookup table)
ID (PK)
FirmwareStatus
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Jun 29, 2006
Hi,
I have a problem with getting the right result with a query.
To this topic I attached a part of my database including 2 queries. The queries are almost the same, except the first field. In query 1 is the total 'Group By' and in query 2 'Count'.The other fields are parameters, which are the same in both queries.
My problem:
If I run query 1 then the result is 31 rows with unique ID's. When I run query 2 the result is 35, because the query counts 4 duplicates.
The correct result I want is 31. That means count the unique ID's. I am able to show the ID's with query 1, but I am not able to count them correctly. I tried to add 'DISTINCT' in SQL view but that didn't help.
Also other solutions written in this forum didn't work.
Thank you if someone (with more query/SQL experience) is able to help me... :o
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Oct 27, 2014
The main table for the database I am working on contains the following fields:
ID
Mfr Control Number
Initial or Follow-Up
Follow-up Number
Suspect
Date of Initial Email
Date Received
Date Submitted
Date of Report
Serious
Brief Description
Causality
Notes
With some additional qualifications I wanted to find records that had an intial report but no follow-up. Which translates too I want records that are unique in the Mfr Control Number field (no duplicates).
I am trying to build a query and keep getting hung up on the unique aspect of fields. I started by trying to query only "Mfr Control Number" fields that are unique (no duplicates). As best I can figure for some reason I can not add any additional fields to that query. My current query is set up in the query build table such that I have added "Mfr Control Number" in two columns. The first column in Total I have "Group By". In the next column I have set Total to "count" with a criteria of 1. If I try to add any other fields from my table than I seem to lose those unique results. But I need to further filter to get the exact information I need.
I want criteria on the "Initial or Follow-up" field to only bring "initial"
I want criteria on the "Serious" field to only bring "serious"
I want criteria on the "Date of This Report" field of "<Date()-"15""
Is there some way to take the results of that initial query to then build a another query based just on those records? I could then apply the further criteria and run my report. Or is there a way to do this in one step?
I've tried to make clear my intention but know it can be difficult to get this kind of stuff down in writing in a clear fashion. I have to be careful to keep information confidential also so some of the details are vague.
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Jul 31, 2013
I have a form which allows the user to add new records to a table. After the user had entered all the information into the form, they click a command button to add the record. In addition to adding the new record, my command button runs an query which is supposed to generate a random number between 1 & 1,000,000,000 and update the record ID field with that number.
Here is the formula I have been using in the "update To" now of my query: Int((1000000000-1+1)*Rnd()+1)
My problem is that I keep getting duplicates. You would think that the chances of getting a duplicate number would be pretty small with this large of a range, but I get a duplicate almost every time.
I have tried indexing (No duplicates) the field in the table, but that did not work. When my query generated a duplicate number, the record was just not added to the table.
I also tried a two step approach:
1-Make a table of all in use record ID numbers from my table (tblIdNo)
2-Update new record with a random number that is not in tblIdNo
This was a no-go too
How to build an update query that will update each new record added to the table with a random number between 1 & 1,000,000,000 without any duplicates? This seems like it should be so simple, and I am starting to get really frustrated.
I would prefer to accomplish this through a query/queries (if possible) rather than with 100 lines of code. This database is not for me, it's for another group, and the individuals in this group are totally freaked out by code.
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Mar 22, 2015
I have created a linked Excel table in Access 2010 called 'tblExcelLinked' and I have a form called 'ASB Log Form' for the purposes of presenting the data in a more readable manner that is easier to view, plus link other fields of data that are not directly related to the 'tblExcelLinked'.
Because there is no unique ID in the 'tblExcelLinked' to create a relationship, I have created a table called 'tblASB', which allows me to add other table data linked from same d/b.
I now want to update the 'tblASB' with data from the 'tblExcelLinked', but only append new records from 'tblExcelLinked', but my inadequate append query is duplicating the records each time I run it, rather than just adding the new ones.
Once sorted my next challenge is a macro so that this runs automatically rather than being manually triggered.
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Sep 23, 2005
I ran the Find Duplicates Query Wizard and it found multiple duplicates. Now how do I go about deleting these duplicates?
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May 11, 2015
I have hundreds of duplicates in my database and i've tried using logic to delete them but there are still thousands left over. I know duplicates can be removed by using VBA, how to use VBA IDE.
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Mar 26, 2015
delete Query How do i Specify the table containing the records that I want to delete?
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May 1, 2015
I have two tables as follows;
Master file:Vessel_master
Vessel_code
Vessel_name
main data table:Main
Vessel_code
container_no
size
Voyage
weight
by using above two table have made a query as follows;
Vessel_name:Vessel_master
Vessel_code:Main
container_no:Main
size:Main
Voyage:Main
weight:Main
Have joined "vessel_code" fields of the both tables by join type 2.
by using the query as data source made a form to edit/update/delete data. the problem is, when delete a record by using the form, it will delete the related data in the master file as well, which i do not want.
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Apr 20, 2015
I have list box named [lstItems], a table named [tblItems] and the field name is [Model]
I would like to (from a list box) delete a record from a button. I have looked and tried lots of delete code, but none of them seem to work.
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May 16, 2007
Hi Guys,
I wanted to delete some duplicate records off of a table.
I went through the steps of copying the structure of a table to a new table then setting the Primary Key as what I wanted to be unduplicated. In my case, I have the Primary Key setup as the Account SSN and the Persons ID. This way it would be OK to have more than 1 SSN as long as I dont have more than 1 SSN and Person ID together.
I have 430 records on my table, when I run the find duplicate query, I see 22 lines (11 duplicates). I went through the table and confirmed that this is correct.
When I paste the original table to the PK table, it copies 392 records. Basically, it didn't copy 27 records it should have. I hunted down the 27 and they were not duplicates, they only had 1 SSN + Person ID.
So to make it short, the easy way to kill duplicates for some reason doesnt work for me.
Is there another way to do this? I was thinking of using the Find Duplicates Query and somehow turning it into a Delete Query, but I would only want it to Delete 1 of each it finds, not all of them.
Once again, thanks for the help.
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Jun 5, 2006
I am a rookie! Have a table with names addresses and years. Want to wittle it down to one name and address per. Ran totals query. Did delete duplicates. When I hit view datasheet, it shows the right info to be deleted, but when I try to run the query, it comes back with "Could not delete from specified tables." When I hit the help button, it says Error 3086 and tells me about read only. I have checked permissions, and I have full permissions. Does anyone have any idea what I am doing wrong?
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Oct 25, 2014
I have a Unmatched query that displays what I need but I want to clean up my database and remove them but its not letting me. See sql below.
Code:
DELETE Warranty
FROM Warranty LEFT JOIN Serials_Repair ON Warranty.[Serial] = Serials_Repair.[Serials_Repair]
WHERE (((Serials_Repair.Serials_Repair) Is Null));
I changed "Delete" it was "Select" thinking that would work but it does not.
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Jun 19, 2015
I was able to create a query that selects records from one table that have several fields which don't match with another table.
The end-game with this query is to have it delete the records in table 1 that don't match records in table 2. The delete query tells me that it could not delete from specified tables.
I've attached the select query, the delete query and the error, and the relationship table for the db.
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Jul 3, 2015
I have a form based on query. Each record has a checkbox.
I would like when activate checkbox to delete the specific record. from a button in the form.
Have not find anything around
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Mar 4, 2015
i keep getting an error "could not delete from specified tables"
I have a table with this data
Main table
bub|12345|1
bub|45678|2
bub|91011|3
Child Table
bub|45678|2
result in Main table
bub|12345|1
bub|91011|3
match from child table and delete from main table.. but i keep getting error "Could not delete from specified table main table has unique records. and it is primary key..
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Apr 3, 2006
I think this is an easy one...
I have two tables - one is a Master. I want to delete the records in the Master if they are in the second table. Here's my SQL and I can't get it to work:
DELETE from TestMaster
INNER JOIN on JoinedDupList
ON TestMaster.ID=JoinedDupList.ID
WHERE JoinedDupList.ID = TestMaster.ID
I'm being told I need to define the table to delete from... I thought I defined it.
Thanks!
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Jun 3, 2013
I am trying to create a delete query that, for a given person, deletes records in Table B that do not have a corresponding record in Table A.
Here are the relevant tables:
tblStates holds StateID, StateName, and RegionID (RegionID is a FK to tblRegions).
tblPeopleStates is a junction table between tblPeople and tblStates.
It lists states assigned to people. It has 3 fields: PersonStateID, PersonID, StateID.
tblPeopleRegions is a junction table between tblPeople and tblRegions.
It lists regions assigned to people. It has 3 fields: PersonRegionID, PersonID, RegionID.
For a given PersonID, I need to delete records (i.e., states) in tblPeopleStates whose RegionID is *not* in tblPeopleRegions.
For example, pretend that tblStates shows that State IDs 1, 5, and 6 are all in Region ID (i.e., all have a RegionID = 10).
If Joe (PersonID = 200) has StateIDs 1, 5, and 6 in tblPeopleStates, but doesn't have a record for RegionID = 10 in tblPeopleRegions, I need to delete his three records in tblPeopleStates (i.e., the ones where StateID = 1, 5, and 6).
PersonID will be found on [Forms]![frmMain]![subform1].[Form]![subform2].Form]![PersonID]
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