How to combine 2 columns of a table database into one in a query in yii2?

Question

Yii

Good morning. A question. How can I combine data of 2 columns in one table using a query?
Table fields id, tour_uniq_id, id_matches, home_team_id, away_team_id, status, ground_type, time_start, round_info .
You need to merge these columns home_team_id, away_team_id