I don’t get what is that? It’s id which auto increase number?
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An index in a database is an aid to help searching for information within specific columns of a database table. But while an index helps searching, it also impacts data being inserted, updated and/or deleted.
No, that’s not an index – it’s a sequence value, used in MySQL so that when you add records to a table, the column value is always unique. Because the value is unique, searching by it will always return the same, single record.