Please solve 10 mint

Assume that the following relation (STD) is vertically fragmented into two fragmer follows: std_id std_name std_dpt std_avg Ali info 60 2 Sara net 77 3 Ahmed sys 90 _name STD = IIstd_id _id,std_ (STD) STD2-IIstd_id std_dptstd_avg (STD) And you have the following query: SELECT std_ovg FROM STD; Write the localized query and the reduced query in terms of operator trees