Question

Is this possible in MySql ?? Can I have an auto-incrementing Primary Key, prefixed with a letter, something like R1234, R1235, R1236… ect ??

Answer 1

What you could do is store the key as two columns. A char prefix and an auto-incrementing int, both of which are grouped for the primary key.

CREATE TABLE myItems (
    id INT NOT NULL AUTO_INCREMENT,
    prefix CHAR(30) NOT NULL,
    PRIMARY KEY (id, prefix),
    ...