create table posts (
id serial primary key,
view_count integer default 0 not null,
vote_count integer default 0 not null
);
create index on posts((case view_count when 0 then 0 else vote_count::float /
view_count end));
class Post(SQL_DB.meta):
__table__ = sa.Table('posts', SQL_DB.meta.metadata, autoload=True)
I need to query Post, ordered by vote_count/view_count with use of index.
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