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Description

This error occurs when you attempt to create a stored program (such as a procedure, function, trigger, or event) with a name that is already in use within the current database. MySQL prevents the creation of duplicate objects to maintain data integrity and prevent ambiguity.

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Error Message

%s %s already exists

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Known Causes

3 known causes

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Duplicated Stored Program Name

You tried to create a stored procedure, function, or event using a name that is already assigned to an existing program of the same type.

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Conflicting Trigger Definition

You attempted to create a trigger with a name that already exists, or a new trigger with the same timing (e.g., BEFORE INSERT) on the same table as an existing one.

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Case Sensitivity Conflict

On some operating systems or with specific collation settings, MySQL might treat names as case-insensitive, leading to a conflict if an object with a different casing but the same name already exists.

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Solutions

4 solutions available

1. Drop and Recreate the Stored Program easy

Remove the existing stored program and then create it again.

1

Identify the exact name of the stored program (procedure or function) that is causing the error. The error message `%s %s already exists` will typically contain the type (e.g., 'PROCEDURE', 'FUNCTION') and the name.

SELECT routine_type, routine_name FROM information_schema.routines WHERE routine_schema = 'your_database_name' AND routine_name = 'your_program_name';

2

Drop the existing stored program using the `DROP` statement. Replace `PROCEDURE` or `FUNCTION` with the correct type and provide the program name.

DROP PROCEDURE IF EXISTS your_database_name.your_program_name;

3

Execute your original `CREATE PROCEDURE` or `CREATE FUNCTION` statement to create the stored program.

-- Your CREATE PROCEDURE or CREATE FUNCTION statement here
-- Example:
-- CREATE PROCEDURE my_procedure() BEGIN
--   SELECT 'Hello World';
-- END;

2. Use `CREATE OR REPLACE` Statement easy

Atomically create or update the stored program if it already exists.

1

Modify your `CREATE PROCEDURE` or `CREATE FUNCTION` statement by adding `OR REPLACE` after `CREATE`. This tells MySQL to replace the existing program if it finds one with the same name.

-- Example for a procedure:
CREATE OR REPLACE PROCEDURE my_procedure()
BEGIN
  SELECT 'Hello World';
END;

2

Execute the `CREATE OR REPLACE` statement. If the stored program exists, it will be updated; otherwise, it will be created.

CREATE OR REPLACE PROCEDURE your_database_name.your_program_name(...)
... -- rest of your procedure definition

3. Check for Typos and Duplicates in Script easy

Ensure the script you are running doesn't have duplicate creation statements.

1

Carefully review the SQL script you are executing. Look for multiple instances of `CREATE PROCEDURE` or `CREATE FUNCTION` statements for the same stored program name within the same script.

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2

Remove any duplicate `CREATE` statements for the same stored program. If you intend to update an existing program, use `CREATE OR REPLACE` or a `DROP` followed by `CREATE`.

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4. Verify Database and Program Names easy

Confirm that you are targeting the correct database and that the program name is accurate.

1

Ensure that your `USE your_database_name;` statement is correctly placed before the `CREATE` statement, or that you are fully qualifying the program name with the database name (e.g., `your_database_name.your_program_name`).

USE my_application_db;

CREATE PROCEDURE my_new_procedure() ...

2

Double-check the spelling of the stored program name in your `CREATE` statement against its actual name in the database. Case sensitivity might be a factor depending on your operating system and MySQL configuration.

SHOW CREATE PROCEDURE your_program_name;

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Related Errors

5 related errors

MySQL Error 1304: Stored Program Already Exists