Implement first only record for joining tables in AOT Queries

Hi Team,

I am developing some AOT queries. There is some duplicates data are in joining tables. I tried to fix it by first only property set to true but its not working with inner join.

I need a solution so that I could fetch single record on the basis of duplicates data column.

I tried with Group by option as well but this way i am getting error as i set range in the same query. 

parent table

join table

Thanks

Ashok Kumar