Check for duplicates before uploading to SharePoint list

[khromykhm]

After thorough research, I am not able to find an answer to my simple question, unfortunately.

I have a SharePoint list with e.g. 5'000 entries:

CustomerCode	Price
X001	10
X002	20
X003	30

I have created a user form for end-users to be able to add new entries to this list. It parses a text copied by a user from Excel and creates a collection that later gets Patched to this SharePoint list (it creates new items in this SharePoint list):

CustomerCode	Price
X004	20
X005	10
X006	40
X001	10

However, I am struggling to understand what would be the best way to do a check if an entry with this CustomerCode already exists in the SharePoint list to avoid any duplicates to be uploaded by a user? In this example, CustomerCode "X001" marked in red color should not be added to our SharePoint list because it already exists. Any ideas on how to accomplish this?

Many thanks in advance!

[RezaDorrani · Accepted solution]

Hi @khromykhm 

The step where you are patching data to SharePoint

Make a check to see if item already exists

IsBlank(Lookup('YourListDataSource',CustomerCode = Userenteredcustomercode))

If this returns true - then Path

If not - that means item already exists

Regards,

Reza Dorrani

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly