Dear Mike

CREATE TABLE session_data (id VARCHAR(32) primary key, data TEXT, last_updated TIMESTAMP);
Query OK, 0 rows affected (0.08 sec)

40

ALTER TABLE session_data CHANGE id id VARCHAR(40) primary key;
Query OK, 0 rows affected (0.14 sec)
Records: 0 Duplicates: 0 Warnings: 0

Love, Mike