Order sql result by occurrence of a set of keywords in a string

Question

For each rows, I want to get the relevance of each description compared to an undefined number of keywords. I know that \"THEN +1\" does not work, but I would like to come to th

Answer 1

You can do this with separate clauses, and add them together:

SELECT *,
       ((CASE description LIKE '%keyword1%' THEN 1 else 0 end) +
        (case description LIKE '%keyword2%' THEN 1 else 0 end) +
        . . .
       ) as relevance_description
FROM (...)
ORDER BY relevance_description DESC;

In some databases, booleans are treated as integers, so you could just write:

SELECT *,
       ((description LIKE '%keyword1%') +
        (description LIKE '%keyword2%') +
        . . .
       ) as relevance_description
FROM (...)
ORDER BY relevance_description DESC;