Query1: select A.customer, count(B.customer) from account A, account B where A.balance <=B.balance group by A.customer Query2: select A.customer, 1+count(B.customer) from account A, account B where A.balance < B.balance group by A.customerConsider these statements about Query1 and Query2.
1. Query1 will produce the same row set as Query2 for some but not all databases. 2. Both Query1 and Query2 are correct implementation of the specification 3. Query1 is a correct implementation of the specification but Query2 is not 4. Neither Query1 nor Query2 is a correct implementation of the specification 5. Assigning rank with a pure relational query takes less time than scanning in decreasing balance order assigning ranks using ODBC.Which two of the above statements are correct?
(A)
(B)
(C)
(D)
Answer
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