DBI202Xuất hiện trong 1 đề thi
Suppose relation $R(A, B)$ has the following tuples: | A | B | | :--- | :--- | | a | 5 | | b | 7 | | h | 8 | | m | 3 | | c | 6 | | b | 2 | | a | 9 | Which tuple is contained in the result of the following query: ```sql SELECT * FROM R WHERE A LIKE 'a%' UNION SELECT * FROM R WHERE B > 7; ```
Các lựa chọn
A(a, 5); (h, 8)
B(a, 5); (a, 9); (h, 8)
C(a, 9); (b, 7); (h, 8)
D(a, 9)