Question

Is there a way to create a table in MySql that it has an automatic ID field, but the ID is not sequential. For example, a random or pseudo random ID.
I have found solutions that suggest generating an ID and try to insert it until an unused ID is found (generating an sequential five digit alphanumerical ID).
but nothing that can be done directly in the table definition, or a simpler trick.

Answer 1

MySQL has a native function UUID() which will generate a globally unique identifier:

mysql> SELECT UUID();
    -> '6ccd780c-baba-1026-9564-0040f4311e29'

You can store its output in a CHAR(36) column.

INSERT INTO table (`uuid`, `col1`, `col2`) VALUES (UUID(), 'someval', 'someval');

According to the documentation though,

Although UUID() values are intended to be unique, they are not necessarily unguessable or unpredictable. If unpredictability is required, UUID values should be generated some other way.

Addendum Another option is UUID_SHORT() for a 64-bit unsigned INT rather than a character field.

mysql> SELECT UUID_SHORT();
    -> 92395783831158784