MySQL · December 20, 2023

How to Fix MySQL Error 1291 - SQLSTATE: HY000 (ER_DUPLICATED_VALUE_IN_TYPE) Column '%s' has duplicated value '%s' in %s

How to Fix MySQL Error 1291 - SQLSTATE: HY000 (ER_DUPLICATED_VALUE_IN_TYPE) Column '%s' has duplicated value '%s' in %s

MySQL is a popular open-source relational database management system used by many websites and applications. However, like any software, it can encounter errors that can disrupt its normal operation. One such error is MySQL Error 1291 - SQLSTATE: HY000 (ER_DUPLICATED_VALUE_IN_TYPE) which occurs when a column in a table has a duplicated value. In this article, we will explore the causes of this error and provide solutions to fix it.

Causes of MySQL Error 1291

MySQL Error 1291 occurs when you try to insert or update a value in a column that already has a duplicate value. This error can be caused by various factors, including:

  • Incorrect data manipulation statements: If you mistakenly execute an INSERT or UPDATE statement that results in a duplicated value in a column, MySQL will throw this error.
  • Missing or incorrect primary key or unique constraint: If a table has a primary key or unique constraint defined on a column, MySQL ensures that the values in that column are unique. If you try to insert or update a duplicate value, MySQL will raise this error.
  • Replication issues: If you are using MySQL replication and there is a conflict between the master and slave databases, it can lead to this error.

Fixing MySQL Error 1291

Here are some solutions to fix MySQL Error 1291:

1. Identify the duplicate value

The first step in fixing this error is to identify the duplicate value causing the issue. You can do this by examining the error message, which provides information about the column and the duplicated value. Use this information to locate the record with the duplicate value.

2. Modify the data

Once you have identified the duplicate value, you can modify the data to resolve the error. You can either delete the duplicate record or update it with a different value. Make sure to update all references to the duplicate value in other tables if necessary.

3. Check primary key or unique constraints

If the error persists even after modifying the data, check if the table has a primary key or unique constraint defined on the column. Ensure that the constraint is correctly defined and that there are no other records violating the constraint. You may need to modify the constraint or remove it temporarily to resolve the error.

4. Verify replication consistency

If you are using MySQL replication and the error is occurring on the slave database, verify the consistency between the master and slave databases. Check if there are any conflicts or discrepancies in the data that could lead to the error. Fixing the replication issues should resolve the error.

Summary

MySQL Error 1291 - SQLSTATE: HY000 (ER_DUPLICATED_VALUE_IN_TYPE) occurs when a column in a table has a duplicated value. This error can be caused by incorrect data manipulation statements, missing or incorrect primary key or unique constraints, or replication issues in MySQL. To fix this error, identify the duplicate value, modify the data, check primary key or unique constraints, and verify replication consistency if applicable.

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