在关系中,“基数”(Cardinality)是指______。A.行数B.属性个数C.关系个数D.列数
在关系中,“基数”(Cardinality)是指______。
A.行数
B.属性个数
C.关系个数
D.列数
在关系中,“基数”(Cardinality)是指______。
A.行数
B.属性个数
C.关系个数
D.列数
A、cardinal numerals
B、ordinal numerals
C、general ordinals
D、quantifiers
A、the dominance of heredity and environment over human beings
B、the uselessness of personal will and efforts of an individual
C、human beings like the animals driving by their desires
D、the bright and hopeful side of social life
A、How it affects different people.
B、How strong its positive effect is.
C、How long its positive effect lasts.
D、How it benefits people physically.
A.ALTER TABLE emp ADD come Date
B.ADD TABLE emp come Date
C.ALTER TABLE emp come Date
D.ADD come Date TABLE emp
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