Question

A while ago @Richard Harris gave a great answer for a similar question, but I believe my situation is slightly different.

As you can see I have 2 consecutive UPDATE statements targeting the same table and fields but with different SET and WHERE clauses.

$this->db->query("
UPDATE user_profiles
SET    reputation = reputation + 15
WHERE  user_id = $answer_author_id;
");

$this->db->query("
UPDATE user_profiles
SET    reputation = reputation + 2
WHERE  user_id = $user_id;
");

I wonder if this can be combined into a single query, or if this requires further normalization. Also, are these consecutive queries too inefficient? If not, I wouldn’t bother trying to combine into a single query.

Your thoughts on this are much appreciated.

Answer 1

you can do this:

UPDATE user_profiles
SET    reputation = reputation + 
           case when user_id = $answer_author_id then 15
                when user_id = $user_id then 2
                else 0
           end
WHERE  user_id = $answer_author_id or user_id = $user_id;