将mySQL查询转换为Laravel SQL查询？

use Illuminate\Support\Facades\DB;

$results = DB::table('table_name')
            ->select('column1', 'column2')
            ->get();

$results = DB::table('table_name')
            ->select('column1', 'column2')
            ->where('column1', '=', 'value')
            ->get();

$results = DB::table('table1')
            ->join('table2', 'table1.column', '=', 'table2.column')
            ->select('table1.column1', 'table2.column2')
            ->get();

$results = DB::table('table_name')
            ->select('column1', 'column2')
            ->orderBy('column1', 'desc')
            ->get();