All MySQL error codes

MySQL error code

MySQL error 1413

MySQL server error 1413 is ER_SP_DUP_HANDLER, reported with SQLSTATE 42000.

Duplicate handler declared in the same block

Error	1413
Name	ER_SP_DUP_HANDLER
SQLSTATE	42000
Group	Server errors

In other databases

PostgreSQL 42000 syntax_error_or_access_rule_violation

Source: MySQL 8.4 Error Reference