How to avoid redundancy when show data in Yii2 Gridview?

Question

I've successfully sorting showed data in Yii2 gridview based on Id. Using $dataProvider in controller:

$dataProvider->setSort([
        'defaultOrder' => ['id' => SORT_DESC]
]);

But it also show data redundant, like this

 __________________________
| Id |   Name   |   City   |
| 1  |  Angela  |  Alabama |
| 2  |  Brenda  |  Boston  |
| 3  |  Angela  |  Alabama |

how to set $dataProvider so it avoid redundancy? So the data in gridview will show like this:

 __________________________
| Id |   Name   |   City   |
| 1  |  Angela  |  Alabama |
| 2  |  Brenda  |  Boston  |

Thanks