Answer Posted / ahmad

ADVANTAGE.
IF THERE ARE MORE THAN ONE TABLE AND THERE EXIST A
RELATIONSHIP BETWEEN THEM BUT THE FIELD IN WHICH THE
RELATION IS MADE IS NOT A PRIMARY KEY IN ONE OF THE TABLE
THEN WE USED FOR ALL ENTRIES .
IT REDUCES REDUANCY OF DATA
RECORDS SHOWS CONSISTENCY .

IT BETTER TO USED FOR ALL ENTRIES INSTED OF NESTED SELECT.

DISADVATAGES.
IF ONE OF THE TABLE IS EMPTY AND WE ARE APPENDING ONE TABLE
WITH OTHER BY USING FOR ALL ENTRIES THEN THE RECORDS TO NOT
VERIFY ITSELF.

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