Introduction to Database System
Which command is used to select distinct subject (SUB) from the table (BOOK)?

SELECT SUB FROM BOOK
SELECT ALL FROM BOOK
SELECT DISTINCT SUB FROM BOOK
All of these
None of these

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Introduction to Database System
A good query system

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

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