下面给出了名称为Loan_Records的数据库表。
Borrower Bank_Manager Loan_Amount
Ramesh Sunderajan 10000.00
Suresh Ramgopal 5000.00
Mahesh Sunderajan 7000.00
以下SQL查询的输出是什么?
SELECT Count(*)
FROM ( ( SELECT Borrower, Bank_Manager
FROM Loan_Records) AS S
NATURAL JOIN ( SELECT Bank_Manager, Loan_Amount
FROM Loan_Records) AS T );
(A) 3
(B) 9
(C) 5
(D) 6答案: (C)
解释:
请参阅http://www.geeksforgeeks.org/database-management-systems-set-4/的问题3
这个问题的测验