android - How to remove duplicate data from ListView

I have a list view that I populated from db like this:

• id: 1, name: Sam, add: Indonesia, rate: 5
• id: 2, name: Bowo, add: Jakarta, rate: 5
• id: 1, name: Sam, add: Indonesia, rate: 3
• id: 2, name: Bowo, add: Jakarta, rate: 3

it was taken from the same db but the result for rate are from different queries. i'd like to remove these kind of duplicates become only like this:

• id: 1, name: Sam, add: Indonesia, rate: 5
• id: 2, name: Bowo, add: Jakarta, rate: 5

how can I do this?? is this possible? thank you