下面的函数调用语句中func 函数的实参个数是func (f2(A1, A2), (A3, A4, A5), (A6, max(A7, A8)));A.3 B.4 C.5 D.8
下面的函数调用语句中func 函数的实参个数是func (f2(A1, A2), (A3, A4, A5), (A6, max(A7, A8)));A.3 B.4 C.5 D.8
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关系模式R(A1,A2,A3,A4,A5,A6,A7),给定函数依赖集合F={ A1àA2; A1àA3; A3àA4;A3àA5;A5à(A6,A7) } 则关于R,既保持依赖又无损连接地分解成第三范式,分解正确的是_________。A.r={R1(A1,A2, A3),R2(A3,A4,A5),R3(A5,A6,A7) }B.r={R1(A1,A2,A3, A4,A5),R2(A5,A6,A7) }C.r={R1(A1,A2, A3),R2(A3,A4,A5,A6,A7) }D.r={R1(A2,A3,A6,A7),R2(A1,A4,A5)}E.其他都不对。
关系模式R(A1,A2,A3,A4,A5,A6,A7),给定函数依赖集合F={ A1àA2; A1àA3; A3àA4;A3àA5;A5à(A6,A7) } 则关于R,既保持依赖又无损连接地分解成第三范式,分解正确的是_________。A.r={R1(A1,A2, A3),R2(A3,A4,A5),R3(A5,A6,A7) }B.r={R1(A1,A2,A3, A4,A5),R2(A5,A6,A7) }C.r={R1(A1,A2, A3),R2(A3,A4,A5,A6,A7) }D.r={R1(A2,A3,A6,A7),R2(A1,A4,A5)}
9、关系模式R(A1,A2,A3,A4,A5,A6,A7),给定函数依赖集合F={ A1àA2; A1àA3; A3àA4;A3àA5;A5à(A6,A7) } 则关于R,既保持依赖又无损连接地分解成第三范式,分解正确的是_________。A.r={R1(A1,A2, A3),R2(A3,A4,A5),R3(A5,A6,A7) }B.r={R1(A1,A2,A3, A4,A5),R2(A5,A6,A7) }C.r={R1(A1,A2, A3),R2(A3,A4,A5,A6,A7) }D.r={R1(A2,A3,A6,A7),R2(A1,A4,A5)}
以下函数调用语句中有________个实参。 func((a1,a2,a3),(a4,a5));A.2 B.5C.1D.不合法