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Explains a littledocumented command in the CL language that can be used to sort and summarize data, create new fields and assign values to them, perform complex joins of multiple files, create new files with existing and calculated files, select records, and other tasks. Begins with the basic operations and advances to complex mapping and selection parameters. First published in 1992, and here augmented with new chapters on date data type, ILE, and Year 2000 concerns. No bibliography. Annotation c. by Book News, Inc., Portland, Or.
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