MySQL error 1075 occurs when a table has more than one AUTO_INCREMENT column or the AUTO_INCREMENT column is not part of a key.
MySQL Error 1075: ER_WRONG_AUTO_KEY means your CREATE or ALTER TABLE statement defines either multiple AUTO_INCREMENT columns or an AUTO_INCREMENT field that is not indexed. Declare only one AUTO_INCREMENT column and make it a PRIMARY KEY or UNIQUE KEY to resolve the issue.
Incorrect table definition; there can be only one auto
MySQL throws error 1075 when a CREATE TABLE or ALTER TABLE statement violates the rule that exactly one AUTO_INCREMENT column is allowed and that column must be indexed.
The server halts the operation to maintain internal consistency.
Because AUTO_INCREMENT relies on an internal counter, the column must be part of a PRIMARY KEY or UNIQUE KEY so MySQL can efficiently generate and retrieve new values.
The error appears during table creation, modification, or migration scripts.
It is common when developers add an AUTO_INCREMENT attribute to a secondary column without removing the original one, or forget to add a key on the new column.
Schema-generation tools and poorly merged migration branches also trigger the issue if they insert duplicate AUTO_INCREMENT markers.
Leaving the schema in an invalid state blocks table creation or alteration, stopping application deployments and CI pipelines.
Resolving the error quickly restores automation flows and guards data integrity by ensuring primary keys remain unique and indexed.
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No. MySQL allows only a single AUTO_INCREMENT column per table, regardless of key status.
It must be indexed as PRIMARY KEY or UNIQUE KEY. Primary is recommended for performance.
Remove AUTO_INCREMENT from the old column, add an index to the new column, then enable AUTO_INCREMENT in one transaction.
InnoDB and MyISAM support it. MEMORY and some others have limitations.
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