按WHERE条款对DB2 SQL结果进行排序

Question

Is there a way to add a sort order to where clauses?

For example

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

I would like to search by relevancy of what the end-user input into a search box, with the last where clause being the most relevant.

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

I think this version could be faster and even more readable:

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