MySQL 1207: Duplicate key found.

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What is

MySQL 1207: Duplicate key found.

 ?
  1. Identify the table and columns involved in the error by examining the error message closely. If the error message does not specify, review the last query attempted.



  1. Check the table structure to identify the primary key or any unique constraints that could be causing the issue. Use the following command, replacing `yourtablename` with the name of the relevant table:


DESCRIBE yourtablename;

  1. Verify if there are duplicate entries in the table for the column(s) identified as having a unique constraint or primary key. Replace `columnname` with the name of the relevant column, and `yourtable_name` with the name of your table:


SELECT column_name, COUNT(*)
FROM yourtablename
GROUP BY column_name
HAVING COUNT(*) > 1;

  1. If duplicates are found, determine the appropriate action for resolving them. This could involve deleting the duplicates, updating them to make them unique, or deciding that no action is necessary and proceeding with a different insertion or update strategy.



  1. If you decide to delete duplicates, here is a general approach. Ensure to adjust `id` and other column names according to your table's structure. This example keeps the row with the lowest `id` for each duplicate `column_name`:


DELETE t1 FROM yourtablename t1
INNER JOIN yourtablename t2
WHERE
t1.id > t2.id AND
t1.columnname = t2.columnname;

  1. If updating is preferred, carefully craft an UPDATE statement that resolves the duplicates by making the values unique.



  1. After resolving duplicates, attempt to perform the original operation that resulted in the error again.



8. Finally, consider adding error handling in your application to catch and manage this error more gracefully in the future, including logging detailed error information for troubleshooting.

Attached error: 
MySQL 1207: Duplicate key found.
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MySQL 1240: Partition is corrupted.
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MySQL 1237: Partition is full.
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MySQL 1225: Duplicate partition name.
MySQL 1224: Partition not empty.
MySQL 1223: Partition key was not found.
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MySQL 1220: Cannot update parent row.
MySQL 1219: Cannot update child row.
MySQL 1216: Cannot delete or update a parent row.
MySQL 1218: Cannot delete child row.
MySQL 1215: Cannot add foreign key constraint.
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MySQL 1214: Row was updated.
MySQL 1213: Deadlock found when trying to get lock.
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MySQL 1206: Error in unique key constraint.
MySQL 1207: Duplicate key found.
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MySQL 1203: Cannot insert entry.
MySQL 1202: Cannot delete entry.
MySQL 1199: Statement failed due to index.
MySQL 1200: Index is corrupted.
MySQL 1201: Duplicate key value.
MySQL 1198: Error closing file.
MySQL 1193: Statement failed due to table.
MySQL 1197: Failed to open file.
MySQL 1175: Statement not allowed in schema.
MySQL 1196: Too many connections.
MySQL 1194: Table needs repair.
MySQL 1195: Table is corrupted.
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MySQL 1165: Error reading from file.
MySQL 1166: Error writing to file.

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