Professor Wael Jabr
October 26 2016
Lab Assignment #5
1. The primary key is STU_NUM because it can be used to uniquely identify each student.
The candidate keys are STU_LNAME, STU_NUM.
2. Department code and
The above represents Flight Delays by Cause. The stats come from
http:/www.transtats.bts.gov/OT_Delay/ot_delaycause1.asp?type=21&pn=1. According to the
stats, Extreme weather was the reason for delay by .72%. Overall, the on time arrival rate is