when i say technologies i am talking about career programming ´s technologies used, when that career programming ´s technologies are solving this post issue; when i say standards i am talking about career programming ´s standards used, when that career programming ´s standards are solving this post issue; when i say rules i am talking about career programming ´s rules used, when that career programming ´s rules are solving this post issue and when i say techniques i am talking about career programming ´s techniques used, when that career programming ´s techniques are solving this post issue; this post issue is finding the technical process used to solve the following issue: you must cross-reference the information of the customers who have bought the most tickets with the Excel file, when generating the mileage report( the miles that customers have accrued are saved in an Excel file ), the system shows duplicate ID numbers for different customers. To give away 20% discount for their next purchase to 3 customers which have flew more with them.