What are three advantages of using a surrogate key rather than the main key to access a relation instead?
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What are three advantages of using a surrogate key rather than the main key to access a relation instead?
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- What three situations make it necessary to make a substitute key instead of the main key of a relation?What are three cases when a surrogate key might be used in place of a relation's main key?What are three signs that a surrogate key should be generated for the primary key of a relation instead of using the main key?
- Identify the normal form it is in. Please make sure to provide explanations to support your answer. Convert it to BCNF. 1.GRADES (S#, C#, sem, year, F#, FName, Sname, Cname, grade, crHrs) a) Write down the following functional dependencies: S# --> C# --> F# --> b) Which normal form is the above relation in? c) Convert it to BCNF: 2.TEACHES (C#, sem, year, F#, Fname, Foffice) a) Write down the functional dependency for F#: F# --> b) Which normal form is the above relation in? c) Convert it to BCNF 3. R (a,b,c,d,e,f,g) Given that: d --> a e --> f,g a) Which normal form is the above relation in? b) Convert it to BCNF:What are three indications that a surrogate key should be constructed for the primary key of a relation?Primary key identifies a unique tuple of a relation, true or false?
- Here are three examples of when it makes sense to create a surrogate key in place of the primary key in a relation.Describe three circumstances when a surrogate key for the primary key of a relation should be created.3) A relation is said to be in 3NF if it is in 2NF and no nonprime attribute of R is blank the primary key. A) an alternate forB) transitively dependent on C) Part of D) partially functionally dependent onE) fully funcionally dependent on