那达慕大会、古尔邦节、歌圩节、望果节依次属于()的传统节日.
A.蒙古族、维吾尔族、壮族、藏族
B.朝鲜族、回族、彝族、黎族
C.维吾尔族、纳西族、土家族、藏族
D.蒙古族、维吾尔族、白族、回族
第1题
What operation on relations R and S produces the relation shown below? (){tuple | tuple∈R∧tuple∈S}
A.union
B.difference
C.intersection
D.division
第2题
A.union
B.difference
C.intersection
D.division
第3题
Let R and S be the following relations:
A.3
B.4
C.5
D.6
第4题
Let R and S be the following relations:
A.3
B.4
C.5
D.6
第5题
Let R and S be the relation respectively:
The number of tuples that the result of the expression R co S (Here is the natural join of relations R and S) is
A.3
B.4
C.6
D.9
第6题
●Let R and S be the relation respection respectively:
Relation R:A B C Relation S:B C D
1 2 3 2 3 4
6 7 8 2 3 5
9 7 8 7 8 1
The number of tuples that the result of the expression R∞S(Here if natural join of relations R and S) is (69) .
(69) A.1
B.4
C.7
D.10
第7题
A.3
B.4
C.6
D.9
第8题
A.3
B.4
C.6
D.9
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