對DB2 SQL結果按WHERE CLAUSE排序

Question

有沒有辦法給where子句添加排序順序？

例如

SELECT * 
FROM media 
WHERE media_title LIKE 'query' 
OR media_title LIKE 'query string' 
OR media_title LIKE 'query string to search for' 

我想通過的相關搜索是什麼最終用戶輸入到搜索框中，隨着最後where子句是最相關的。

Answer 1

SELECT * 
FROM media 
WHERE media_title LIKE 'query' 
    OR media_title LIKE 'query string' 
    OR media_title LIKE 'query string to search for' 
ORDER BY case 
    when media_title LIKE 'query' then 1 
    when media_title LIKE 'query string' then 2 
    when media_title LIKE 'query string to search for' then 3 
end 

Answer 2

我覺得這個版本可能會更快，甚至更具可讀性：

SELECT * 
FROM media 
WHERE media_title IN ('query', 
         'query string', 
         'query string to search for') 
ORDER BY case 
    when media_title = 'query'      then 1 
    when media_title = 'query string'    then 2 
    when media_title = 'query string to search for' then 3 
    end