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Explain P command in the respect of QBE?
P: It is the command in which is used to print (logically display) the value of the attribute in whose cell it is written. To shown the whole relation, P has to be written in each field or through placing a single P in the column headed through the relation name also displays entire relation.
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Describe about Use Case and external case in DFD The processes are transformed those into the Use Case and external case in DFD has same characteristics which of an actor in O
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