Introduction to Database System
A good query system

allows non-programmers to access information stored in a database
can accept English language commands
can be accessed only by data processing professionals
None of these
both (a) and (b)

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Introduction to Database System
With respect to data input, the most accurate description of batch control is

All of these
controlling the input of each input clerk
None of these
comparing to a pre-calculated figure the total of a data item summed across a batch records put into the system
dividing documents to be entered into batches

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