How to upgrade data using load data page?

Hi all

im doing a migration page where my user will provide the csv file, so I could load into my table. problem is that loading data using apex collection so I know columns are limited, but I forgot how. (probably 40 something).

So I decided to split the csv file with the two files with a common column, which is a key. If im guessing two files can be linked using this key. However when I upload the second file, he will still do an insert instead of update action. How updated? is this what I need to set or activate?

just to check that I tried to download the csv... and then changed some content inside and re upload... even if I that.it always inserts instead of update. Can anyone share how can I update? It's really important because I have a lot of columns to download. so in my situation, the best way is to separate files.

Help, please...

In components, under the loading of data shared. On the model of your table, you specify the unique columns (up to 3). I believe that if there is no match, it will insert. If it finds a matching record, it will update. So if you have a single column that is in each worksheet, you must specify here

Tags: Database

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