关系模式stj(s#,t,j#)中,存在函数依赖:(s#,j#)→t,(s#,t)→j#,t→j#,则( )。(0.29分)
A.关系stj满足1nf.但不满足2nf
B.关系stj满足2nf.但不满足3nf
C.关系stj满足3nf.但不满足bcnf
D.关系stj满足bcnf.但不满足4nf
正确答案是C
关系模式stj(s#,t,j#)中,存在函数依赖:(s#,j#)→t,(s#,t)→j#,t→j#,则( )。(0.29分)
A.关系stj满足1nf.但不满足2nf
B.关系stj满足2nf.但不满足3nf
C.关系stj满足3nf.但不满足bcnf
D.关系stj满足bcnf.但不满足4nf
正确答案是C