更多"[A] across [C] from[B] to [D] thr"的相关试题:
[单项选择][A] across [C] from
[B] to [D] through
A. across
B. to
C. from
D. through
[单项选择]A) from C) with
B) in D) between
A. from
B. in
C. with
D. between
[单项选择]A) for C) of
B) from D) with
A. for
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[单项选择]设有关系R(A，B，C)和S(C，D) 与SQL语句SELECT A，B，D FROM R，S WHERE R.C=S.C等价的关系代数表达式是
[单项选择]设有关系R(A，B，C)和S(C，D)与SQL语句SELECT A，B，D FROM R，S WHERE R.C=S．C等价的关系代数表达式是
[单项选择]设有关系R(A，B，C) 和S(C，D) 。与SQL语句select A，B，D from R，S where R.C=S．C等价的关系代数表达式是
A. R．C=s.c(пB.D(R×S))
B. B．пB.D(σR.C=s.c(R×S))
C. C．σR.C=s.c((σB R)×(пDS))
D. D．σR.C=s.c(пD((пB.E)×S))
[单项选择]设有关系R(A，B，C)和S(C，D)。与SQL语句select A，B，D from R，S where R.C=S.C等价的关系代数表达式是______。
A. σR.C=S.C(∏A,B,D(R×S))
B. ∏A,B,D(σR.C=S.C(R×S))
C. σR.C=S.C(∏A,BR)×(∏DS))
D. σR.C=S.C(∏D(∏A,BR)×S))
[单项选择]设有关系R(A，B，C)和S(C，D)，与SQL语句SELECT A，B，D FROM R， S WHERE R.C=S.C等价的关系代数表达式是( )。
A. σR.C=S.C(ЛA,B.D(R×S))
B. ЛA,B,D(σR.C=S.C(R×S))
C. σR.C=S.C(ЛA,B(R)×(ЛD(S))
D. (σR.C==SC(ЛD(ЛA,B(R×S))
[单项选择][A] from [C] as
[B] than [D] away
A. from
B. than
C. as
D. away
