MySQL UPDATE using IF condition

Question

I\'m not even sure if this is possible but I\'m trying to do different UPDATE if a certain condition is met.

user [id, start_date(NOT NULL), end_date(NULL), reason(N

Answer 1

Since the only difference is whether you are setting ur.end_Date to either the current Date or setting it to it's existing date could you not just use the following:

UPDATE user p  
JOIN user_roles ur 
ON p.id = ur.user_id  
SET 
ur.end_date = IF (ur.end_date IS NULL, NOW(), ur.end_date),
p.end_date = NOW(), 
p.reason = "Retired" 
WHERE p.id = 5