生产建设兵团是指中国建国后陆续组建的各类生产建设兵团，是中国通过军垦这种特殊体制达到巩固边防，发展经济，安置人员的目的，兵团成为党、政、军权合一，工、农、兵、学、商五位一体的半军事化组织和社会经济体系
I have multiple columns in a mySQL table. Three of the columns are named i100s, i60s and i25s and what I want to do is get the sum of all three entries . currently I have this code
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