Nem hülyeség az, hogy egy adatbázis táblába mindig rak valaki egy auto incrementes id-t?

Kicsit sem hülyeség .... Egy programozási nyelvel (pl.: php) szeretnél mindig egy egyedi random számot generálni vagy mi?

Az mitől lenne egyszerűbb?

Mitől lenne jól átláthatóbb?

Mitől lenne jobb egy olyan megoldás?

Some people prefer to use an integer column as the primary key, to serve as a surrogate key that never needs to change, even if other columns are subject to change. Although there's nothing preventing a natural primary key from being changeable too, you'd have to use cascading foreign key constraints to ensure that the foreign keys in related tables are updated in sync with any such change.

The primary key being a 32-bit integer instead of a varchar can save space. The choice between a int or a varchar foreign key column in every other table that references your user table can be a good reason.

Inserting to the primary key index is a little bit more efficient if you add new rows to the end of the index, compared to of wedging them into the middle of the index. Indexes in MySQL tables are usually B+Tree data structures, and you can study these to understand how they perform.

Some application frameworks prefer the convention that every table in your database has a primary key column called id, instead of using natural keys or compound keys. Following such conventions can make certain programming tasks simpler.