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並前往https://vettabase.com/blog/why-tables-need-a-primary-key-in-mariadb-and-mysql/

Why Tables need a Primary Key in MariaDB and MySQL

1 Implicit primary keys · 2 Fast queries · 3 Clustered index and dict_sys->mutex · 4 Primary key, the binary log and replication · 5 Primary key and ...

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