1 1 vote R A B 1 2 3 4 5 5 5 8 S A B 1 2 3 2 4 4 Null 5 Null 6 6 9 Can we say that A-> B in R and S? Databases database-normalization databases + – rahul sharma 5 1.3k views answer comment Share Follow Print 0 reply Please log in or register to add a comment.
0 0 votes ****yes,we can say A->B in both R and S ***** because A->B means the attribute B contain some value which is unique for every value of A, that means B does not contain two value for 1 unique value of a. alokraj1142 answered Jul 16, 2017 alokraj1142 comment Share Follow See all 8 Comments 8 8 Comments reply Show 5 previous comments rahul sharma 5 commented Jul 17, 2017 reply Follow flag @ AnilGoudar this is the given DB table.Its not particular instance 0 0 replyShare AnilGoudar commented Jul 18, 2017 reply Follow flag @Rahul, If that is the case, then we can sure about FD's unless no additional tuples are added to table. 0 0 replyShare rahul sharma 5 commented Jul 18, 2017 reply Follow flag But what about Nulls and empty records? 0 0 replyShare Please log in or register to add a comment.
