<p>Error 1630 occurs when MySQL cannot find a referenced stored function because multiple functions share the same name or the function truly does not exist.</p>
<p>MySQL Error 1630: ER_FUNC_INEXISTENT_NAME_COLLISION means the server cannot resolve a function call because the named routine does not exist or clashes with another of the same name. Confirm the function's schema, qualify the call with database_name.function_name, or create the missing routine to fix it.</p>
FUNCTION %s does not exist. Check the 'Function Name
Error 1630 fires when a SELECT, INSERT, UPDATE, or CALL statement references a function name that MySQL cannot resolve uniquely. The server either finds no routine with that name or detects multiple routines with identical names across databases, creating a name collision.
The SQLSTATE 42000 signals a syntax or semantic problem. Although the SQL syntax may look correct, the resolver fails during parsing because the function definition is absent or ambiguous, stopping execution immediately.
It usually surfaces after migrating databases, dropping routines, restoring dumps in a new schema, or switching the default database without fully qualifying routine names. Developers often meet it during code deployment when stored functions reside in a different environment or have been overwritten by conflicting names.
Unresolved routine calls break data pipelines, stop application logic, and can leave transactions open. Fast correction maintains application uptime and prevents cascading failures in dependent services.
Missing function - The referenced routine was never created in the active database or was dropped accidentally.
Name collision between databases - Two different schemas contain functions with the same name, and the current search path confuses MySQL.
Incorrect default database - The session changed databases with USE, so an unqualified function name now points to the wrong schema.
Privilege issues during dump/restore - Functions were skipped due to DEFINER or security context problems, leaving calls behind without their definitions.
Typographical error - A typo in the function name leads the parser to search for a non-existent routine.
Raised when a stored procedure is missing. Similar cause but for procedures, not functions.
Occurs when a function exists but the caller lacks EXECUTE privilege.
Thrown when creating a routine with a name that already exists in the current schema.
Happens when no database is selected, leading to ambiguous object references.
Run SELECT DATABASE(); to view the current default database. If it is NULL, fully qualify the function with schema.function_name to avoid ambiguity.
No. MySQL intentionally prevents ambiguous routine calls. Always resolve collisions by qualifying names or dropping duplicates.
Not if the function is missing. EXECUTE privileges matter only when the routine exists but is inaccessible. Error 1630 indicates resolution failure, not permission denial.
MySQL does not support a search_path like PostgreSQL. Use the USE statement or fully qualified names to control routine resolution.
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