0 votes 0 votes let x y z a b c be the attributes of an entity set.E.if {x},{x,y},{a,b},{a,b,c},{x,y,z} are superkeys then which of the following is candidate key? a){x,y} and {a,b] b){x} and {a,b } c){x,y,z} and {a,b,c} d){z} and {c}..with explanation neha singh asked Jun 26, 2016 neha singh 2.1k views answer comment Share Follow See all 0 reply Please log in or register to add a comment.
1 votes 1 votes Option B How ? Candidate keys are a special subset of super keys that do not have any extraneous information in them. Desert_Warrior answered Jun 26, 2016 Desert_Warrior comment Share Follow See all 0 reply Please log in or register to add a comment.
0 votes 0 votes candidate keys : if any proper subset of super key is also a super key then that Sk is not a candidate key, so here .. x, xy , ab , abc ,xyz .... these are Sk, for example x is proper subset of xy so, xy is not a candidate key BUT x is a Sk according to me Ckeys are x, ab , SO OPTION B IS ANSWER shweta1920 answered Apr 23, 2017 shweta1920 comment Share Follow See all 0 reply Please log in or register to add a comment.