对DB2 SQL结果按WHERE CLAUSE排序

Question

有没有办法给where子句添加排序顺序？

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' 

我想通过的相关搜索是什么最终用户输入到搜索框中，随着最后where子句是最相关的。

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

我觉得这个版本可能会更快，甚至更具可读性：

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