IF() statement alternative in SQLite

Question

I have the code for MySQL (perl):

UPDATE pages
SET rkey = rkey + 2,
    lkey = IF(lkey >= $key, lkey + 2, lkey)
WHERE rkey >= $key

I

Answer 1

UPDATE pages
SET rkey = rkey + 2,
    lkey = IF(lkey >= $key, lkey + 2, lkey)
WHERE rkey >= $key

??? it to

UPDATE pages
SET lkey = lkey + 2
WHERE rkey >= $key AND lkey >= $key

UPDATE pages
SET rkey = rkey + 2,
WHERE rkey >= $key

Isn't it better?