如何優先考慮或條件超過其他條件的MySQL？

Question

我有一個使用子查詢的sql查詢。

SELECT t.id FROM subjects t 
where t.topic_id IN (13,11) 
    AND t.id not in (select subject_id 
        from user_visited_subjects uvs 
        where uvs.user_id = 3) 
    OR t.id in (select subject_id 
       from user_subject_suggestions uss 
       where uss.user_id = 3) 
limit 10 

我想給優先級或條件意味着SQL應檢查是否有查詢的任何記錄

OR t.id in (select subject_id from user_subject_suggestions uss where uss.user_id = 3) 

再檢查其他條件。

請指教。

謝謝

Answer 1

只需使用圓括號。

例子：

SELECT t.id FROM subjects t 
WHERE t.id IN (SELECT subject_id FROM user_subject_suggestions uss WHERE uss.user_id = 3) 
    OR (t.topic_id IN (13,11) 
     AND t.id NOT IN (SELECT subject_id FROM user_visited_subjects uvs WHERE uvs.user_id = 3)) 
LIMIT 10