MySQL 1090: Table already exists.

When encountering the error 1090: Table already exists in MySQL, follow these steps:

  1. Identify the Existing Table: Run the query `SHOW TABLES;` to list all tables in the current database. Look for the table name mentioned in the error message.



  1. Check Table Schema: To understand why the operation causing the error was attempted, check the schema of the existing table by running `DESCRIBE tableName;` Replace `tableName` with the name of the table causing the error.



  1. Review the Operation Causing the Error: Determine whether the operation was intended to create a new table, alter an existing one, or if it was a mistaken operation. If you were trying to create a new table, ensure the table name is correct and does not conflict with existing tables.



  1. Check Application Logs: If the operation was triggered by an application, review the application logs around the time the error occurred to understand the context and actions leading up to the error.



  1. Data Backup: Before making any changes, especially if you're considering dropping or altering the existing table, ensure you have a recent backup. You can back up a table with `mysqldump -u username -p databaseName tableName > tableName_backup.sql`.



  1. Resolve the Conflict:


- If the table was not supposed to exist, and you've backed up any necessary data, you can drop it with `DROP TABLE tableName;`.
- If you were trying to add to an existing table but got the name wrong, correct your operation to refer to the appropriate table.
- If the operation was meant to create a new table but mistakenly used an existing name, rename the existing table if it is no longer needed, or change the name for the new table. To rename a table, use `RENAME TABLE oldTableName TO newTableName;`.

  1. Retry the Operation: After resolving the naming conflict or any other issues, retry the original operation ensuring the table names are correct and do not conflict with existing tables.



8. Monitor for Recurrence: If the operation is part of an automated process or script, monitor for recurrence of this error to ensure the underlying issue has been fully resolved.

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