MySQL 8.0 Release Notes
MySQL 8.0 Source Code Documentation
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This section provides a reference for the various types of error messages in MySQL:
Error messages produced only by the server: Section B.3.1, “Server Error Message Reference”
Error messages that originate only from within the MySQL client library: Section B.3.2, “Client Error Message Reference”
Error messages that are shared between the server and the client library: Section B.3.3, “Global Error Message Reference”