mysql 实现按相似度来排序

select *from (select *, case when words like ‘%dog%’ then 1
when words like ‘%og%’ then 2
when words like ‘%g%’ then 3
when words like ‘%o%’ then 4 end as rn
from test
where words like ‘%dog%’ or words like ‘%og%’ or words like ‘%g%’ or words like ‘%o%’ ) as k
order by rn;