data cars_subset; set sashelp.cars; where upcase(drivetrain)="FRONT"; RUN; data cars_subset; set sashelp.cars; where drivetrain=upcase("front"); RUN; first one produces 226 obs and 15 columns and second one produces 0 obs and 15 columns why it produces two different results ?? and please brief me about how upcase function works like this situation?
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