On-line, On-time, On-budget

This time-saving book shows you how to exploit the power
of IBM's Open Query File (OPNQRYF) to sort, select,
summarize, and join data for input to programs. With
OPNQRYF, you can allow end users to see data sorted the
way they want it, to see only the data fields they are
interested in, to calculate new fields, or see data in
summary ......