data over175;
set ia.dfwlax;
length City $ 11;
Total=sum(FirstClass,Economy);
if Total le 175 then delete;
if upcase(Dest)='DFW' then
Revenue=sum(1500*FirstClass,900*Economy);
City='Dallas';
else if upcase(Dest)='LAX' then
Revenue=sum(2000*FirstClass,1200*Economy);
City='Los Angeles';
run;
日志:显示没有匹配的if-then子句,请问错误在哪里?
谢谢!