按WHERE条款对DB2 SQL结果进行排序

Question

有没有一种方法可以向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'

我想按最终用户在搜索框中输入的内容的相关性进行搜索，最后一个where子句最相关。

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

我认为此版本可能会更快，更易读：

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