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Description

This error indicates that MySQL cannot find a user-defined function (UDF) or a built-in function with the specified name. It typically occurs when attempting to call a function that has not been created, is misspelled, or is not accessible in the current database context.

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Error Message

FUNCTION %s does not exist. Check the 'Function Name Parsing and Resolution' section in the Reference Manual

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Known Causes

4 known causes

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Typographical Error in Function Name

The function name specified in the SQL query contains a typo, leading MySQL to believe no such function exists.

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Function Not Created or Installed

The user-defined function (UDF) has not been properly created, loaded, or installed on the MySQL server instance.

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Incorrect Database Context

The function exists but is defined in a different database or schema than the one currently in use, and its name is not fully qualified.

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Case Sensitivity Mismatch

MySQL's `lower_case_table_names` system variable might affect how function names are resolved, leading to a mismatch if the case is not exact.

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Solutions

4 solutions available

1. Verify Function Name and Case Sensitivity easy

Double-check that you are using the correct function name, paying attention to case sensitivity.

1

Review the SQL statement where the error occurs. Ensure the function name is spelled correctly and matches the actual name of the function.

SELECT my_custom_function(column_name) FROM my_table;

2

Remember that function names in MySQL can be case-sensitive depending on the operating system and MySQL server configuration. If you're unsure of the exact casing, try calling the function in all lowercase or all uppercase.

SELECT MY_CUSTOM_FUNCTION(column_name) FROM my_table;
SELECT my_custom_function(column_name) FROM my_table;

2. Check Function Existence and Schema medium

Confirm that the function exists in the database and that you are referencing it from the correct schema.

1

Query the `mysql.general_log` or `information_schema.ROUTINES` table to see if the function is registered. Replace 'your_function_name' with the actual name of the function.

SELECT ROUTINE_NAME FROM INFORMATION_SCHEMA.ROUTINES WHERE ROUTINE_TYPE = 'FUNCTION' AND ROUTINE_NAME = 'your_function_name';

-- Alternatively, if you have general_log enabled:
-- Check your MySQL general log file for entries related to function creation or execution.

2

If the function is defined in a different schema (database), you need to qualify the function name with the schema name. For example, `schema_name.function_name()`.

SELECT my_schema.my_custom_function(column_name) FROM my_table;

3

If the function does not appear in `INFORMATION_SCHEMA.ROUTINES`, it means it hasn't been created or was dropped. You will need to recreate it.

CREATE FUNCTION my_custom_function(input_param INT) RETURNS INT
BEGIN
  -- Function logic here
  RETURN input_param * 2;
END;

3. Grant Necessary Privileges to the User medium

Ensure the MySQL user executing the query has the `EXECUTE` privilege for the function.

1

Connect to your MySQL server as a user with sufficient privileges (e.g., `root`).

mysql -u root -p

2

Grant the `EXECUTE` privilege for the specific function to the user. Replace `your_user`, `your_host`, and `your_function_name` accordingly.

GRANT EXECUTE ON FUNCTION your_function_name TO 'your_user'@'your_host';
FLUSH PRIVILEGES;

3

If the function is part of a stored procedure or is in a package, you might need broader privileges like `SELECT` on the `mysql.general_log` or `EXECUTE` on the stored procedure itself.

-- Example for granting EXECUTE on a stored procedure:
GRANT EXECUTE ON PROCEDURE your_stored_procedure TO 'your_user'@'your_host';
FLUSH PRIVILEGES;

4. Re-create or Recompile the Function advanced

If the function definition is corrupted or the server state is inconsistent, re-creating the function can resolve the issue.

1

First, try to get the function definition to understand its structure. If you can't directly query it, you might need to rely on backups or source control.

-- This query will show the definition if the function exists and you have privileges.
SELECT ROUTINE_DEFINITION FROM INFORMATION_SCHEMA.ROUTINES WHERE ROUTINE_TYPE = 'FUNCTION' AND ROUTINE_NAME = 'your_function_name';

2

Drop the existing function (if it exists and you can confirm its definition). Be cautious, as this is irreversible.

DROP FUNCTION IF EXISTS your_function_name;

3

Re-create the function using its original definition. Ensure the syntax is correct and all dependencies are met.

CREATE FUNCTION your_function_name(param1 INT, param2 VARCHAR(255))
RETURNS VARCHAR(255)
DETERMINISTIC
BEGIN
  -- Your function's logic here
  RETURN CONCAT(param1, '-', param2);
END;

4

After re-creation, test the function thoroughly to ensure it works as expected.

SELECT your_function_name(123, 'test');

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Related Errors

5 related errors

MySQL Error 1630: Function Does Not Exist