Question about tables

public function table(Table $table): Table
    {
        return $table
            ->query(Backup::query()
                ->select(
                    'backups.backup_date',
                    'backups.backup_status',
                    'backups.observations',
                    'servers.name as server_name'
                )
                ->join('servers', 'backups.server_id', '=', 'servers.id'))
            ->columns([
                Tables\Columns\TextColumn::make('server_name')
                    ->sortable(),
                Tables\Columns\TextColumn::make('backup_date'),
                Tables\Columns\TextColumn::make('backup_status'),
            ])
            ->defaultSort('backup_date')
            ->paginated(false);
    }