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All versions of MySQL (not Microsoft SQL Server). Please also add a version-specific tag like mysql-5.7 if that is relevant to the question.

3 votes

1062 Duplicate entry but there are no duplicates?

You might have reached the limit of your id column (the PRIMARY KEY). For instance, if your column is defined as tinyint(4), once you reached the value of 127, you can't get higher. When you try to in …
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