I've added a data load page using the data load wizard in oracle apex. My problem is I just noticed that I can reupload the csv file that's been uploaded already (containing the same records), which causing for duplicate records. How can I add a validation to not proceed the uploading once the data is already existing?
How to add validation to not import existing record using ORACLE APEX data load wizard
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From my point of view, the simplest option is to create unique index which will prevent duplicates, i.e. Oracle will reject such rows itself.
If you want to make it "smarter", then you could create another table which contains file names you're uploading; then - after you choose which file you'll load - check whether that name already exists in table of previous imports and don't load it again.