codeigniter - Calculate a variable using 2 Mysql tables and make a select based on that variable -

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i own online game in become coach of rugby team , started optimize database. website uses codeigniter framework.

i have following tables (the tables have more fields posted important now):

leagues: id standings: league_id, team_id, points teams: id, active

previously, having in leagues table field named teams. representing number of active teams in league (of users logged in recently). so, doing following select random league has between 0 , 4 active teams (leagues less teams first).

select id leagues teams>0 , teams<4 order teams asc, rand( ) limit 1

is there way can same command without having add teams field? efficient? or it's better keep teams field in database?

later edit

this did until now:

    function test() {     $this->db->select('league_id, team_id');     $this->db->join('teams', 'teams.id = standings.team_id');     $this->db->where('active', 0);     $query = $this->db->get('standings');     return $query->result_array(); }

the function returns inactive teams alongside league_id. how count number of inactive teams in each league , how sort them after number?

try this:

select league_id standings s join teams t on t.id = s.team_id , t.active group 1 having count(*) < 5

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