Discussion
What will be the number of columns and rows respectively obtained for the operation, A- B, if A B are Base union compatible and all the rows of a are common to B? Assume A has 4 columns and 10 rows; and B has 4 columns and 15 rows
Answer: A
Correct answer: 4,0
The difference \( A - B \) keeps A's columns, so the degree is still 4. It returns the tuples of A that are not in B, and every row of A is said to appear in B, so no rows remain.
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