php - how to join two tables using eloquent or query builder -


i have query lists topics 2 users have in common. 

$subcommon= subjectuser::selectraw('topic_id, count(topic_id) aggregate')      ->wherein('user_id', [4, 2])->groupby('topic_id')      ->having('aggregate','>',1)->get();

for example query result table below be

{"topic_id":3,"aggregate":1}

tableone

id|user_id|topic_id  1|2      |3  2|4      |3  3|5      |1

i have table(tabletwo) has topic_id join query result of row 2 second table. how go doing this?

tabletwo

id|group_id|topic_id  1|6      |2  2|7      |3  3|7      |1 

db::table('tableone')->join('tabletwo', function($join) {     $join->on(tableone.topic_id, '=', tabletwo.topic_id); })->get();

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