Questions about forum posts

Forum Post questions how to name the primary key of the forum post database. Will two people use one post number at the same time if they follow the post order. The combination of primary keys or numbers for each user name. Share to: more forum posts
How to name the primary key of the forum post database.

Will two people use one post number at the same time if they follow the post order.
The combination of primary keys or numbers for each user name.

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------ Solution --------------------
The primary key is unique, and the primary key id = 3 when the data is added again, the primary key is 4.

Delete a single
Delete from tabelname where id = 1;

Delete multiple
Delete from tablename where id in (1, 2, 3 );