Случай внутри Laravel Query
DB::table('ref')->select(['id','name',DB::raw('(case when (id > 17) then "yes" else "no" end) as present')])->get();
Puzzled Platypus
DB::table('ref')->select(['id','name',DB::raw('(case when (id > 17) then "yes" else "no" end) as present')])->get();
->select('shares.id AS share_id', 'users.id AS user_id', 'shares.connected_user_id',
'shares.original_language_id', 'shares.image',
'users.first_name', 'users.last_name', 'users.email',
'locations.city', 'provinces.name', 'countries.code',
'locations.lat', 'locations.lng',
'shares.created_at',
DB::raw('(CASE WHEN users.id = ' . $user . ' THEN 1 ELSE 0 END) AS is_user')
)