"duplicate entry for key" Code Answer's

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duplicate entry for key

Santino on Mar 16, 2021

The error says it all:

Duplicate entry '' 
So run the following query:

SELECT unique_id,COUNT(unique_id)
FROM yourtblname
GROUP BY unique_id
HAVING COUNT(unique_id) >1
This query will also show you the problem

SELECT *
FROM yourtblname
WHERE unique_id=''
This will show you where there are values that have duplicates. You are trying to create a unique index on a field with duplicates. You will need to resolve the duplicate data first then add the index

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"duplicate entry for key" Code Answer's