How to not display certain information in a table

[Manuel174102]

Hello Everyone,

I have the following table 

Num	Line
1	10000
1	30000
2	20000
2	40000
3	10000
3	50000
3	10000
3	20000
4	10000
4	20000

and I just need this : 

Num	Line
1	10000
2	30000
3	10000
4	10000

I need to only keep the smaller "LINE" for each number. Can I do it in the front end? or should I do it in the back end?

Thanks

[BrunPierre]

@Manuel174102  as @Lakshminarayanan_J  suggested you may have to share specific details as to why it doesn't work for you because all the suggestions seem correct.