Web Reference: Jan 24, 2026 · Learn how to diagnose and fix MySQL duplicate entry errors for primary keys including auto-increment issues, upsert patterns, and data migration conflicts. Oct 30, 2012 · MySQL is responding with misleading error and I got mine solved with trick below. Since I have only about ten rows of data, and I was performing the insert on an empty table, I can be pretty sure duplication is not possible. Mar 2, 2024 · If you’re getting an error in MySQL that reads something like “ Duplicate entry ‘1’ for key ‘person.PRIMARY’ ” when trying to add a primary key to an existing table, it’s probably because the table already contains duplicate values in the column you’re trying to add the primary key to.
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