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How do I stop duplicate entries in a table from an append query?

How do I stop duplicate entries in a table from an append query?
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How do I get my append query working so it doesnt append duplicates onto an existing table? Currently if I run the append query I get multiples of the same data?
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How do I stop duplicate entries in a table from an append query?

How do I get my append query working so it doesn't append duplicates onto an existing table? Currently if I run the append query I get multiples of the same data?

Duplicate Values

I have a handheld barcode scanner which sends data to a CSV file that is then imported to an Access 2003 database. From the import table, the data is appended to a user table with primary keys set to prevent duplicate data. I use 5 fields to make a primary key. The problem is that we update one field of the five to indicate a process. This changes the data in the user database and allows the original record to be re-imported as a duplicate because that particular field does not match anymore.

I am looking at how best to address this. I do have an autonumber field that I could use to prevent duplicate entries from being imported, but I am not aware of the ability to do 2 successive key check operations on an append query.

My next thought was to append with the duplicates and then do a delete query. I need to keep the record with added data, not the one that will be reimported. Not sure how I could do that query

Append Query : only new credits are added to the Ledger

I am trying to append to my Ledger credits showing in my downloaded Bank Statements. In my Ledger Table I have set 3 fields as Primary Keys (Donor Number, Amount and Date) as there should never be duplicate entries for all 3 fields.

My append query selects the credits from my Bank Statement and inserts them into the Ledger. But I would expect the use of the 3 Primary Keys to ensure that only new credits are added to the Ledger.

But I am finding that all credits (including entries already in the Ledger)

Append Query with two distinct criteria

I have an append query that uploads external data into a table. It is currently set up for 1 distinct criteria, ie, the CAN number of hardware does not already exist. I've done this byadding the CAN field in again at the end of the append query and use Is Null to filter.

However, I now need to create another table that could allow for duplicate CAN additions depending on the lifecycle of this hardware and therefore need to add a 2nd criteria to stop duplicate uploads.

Therefore, is it possible to have 2 criteria that if both are met, do not append the record, but if only 1 is met, will append the record?

The other field I'm using will be the date the account was flashed. So, what I need to have is where CAN + Date are matched, ignore record, if CAN or Date are matched, add record and ofcourse if neither exist, add record.

Is it as simple as adding in a 2nd field using Is Null for date as well or would this not work?

Append Query position

I am quite new to using access and I have a database set up with date, title and event. I have a table with 2000 entries and have created a form to add new entries to the table -- where lies my problem. I have created an append query with each column of the table that references the table and each references the correct combobox/textfield on the form. I have a "submit" button on the form that runs the query with the data entered on the form. After I click submit, a confirmation message comes up and I click yes to run the query. Then a second window comes up that says "You are about to append 0 row(s)" -- which is not my intention.

It's probably a small thing, but I have never used this append function before and am not totally sure how it runs. What do I need to do to make it append the data that it is passed?

Append Query : stop importing duplicates

A table with over 2000 records in is the main source table for our Controls Database, it has SalesOrders on etc etc.

I am trying to import fresh data everynight into, and thought an Append Query would be the way forward.

It does work to a degree, but how do I stop it from importing duplicates

append query error

Running an append query. It works when I have existing date in the table and append. When I add a new record and try to append to another table, it is not working. Giving me type conversion failure table key violations
lock violations validation rule violations.

This is a lot of violations for an append query.

After stop running macro get this error cannot find the 'l' you entered into the expression have checked all the table properties, form properties, query stuff, etc.

append query : how to append only new updates

I'm trying to make a query that will append data from one table into another table. I've done this successfully, however I only want to append entries that have a new update. If a row is the same as it was before, I don't want it to be appended to the new table.

For example: My first table is a list of ongoing projects. One project may have an update added to a field, but another project may not. Right now my query is appending every row to the new table whether or not it is the exact same as it was previously (aka no updates, nothing new).


append query without duplicate record

I create a append query but every time I run this query records duplicate,

I have a form and a button in form, user type required records in form and then press button, in event click button I have
docmd.openquer "append query"

but every time in table create duplicate records

Create a Query in Microsoft Access to Find Duplicate Entries in a Table

There are many causes for duplicate data: for instance if you have multiple users entering data simultaneously via linked tables, or you might inherit a table with duplicate data already entered.
Running into duplicate data in an Access Database can be quite annoying during the hectic workday, so I decided to write up a technique to help identify the duplicate records so you can manually handle them.