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If both the functional dependencies : XY and YX hold for two attributes X and Y then the relationship between X and Y is

A. M:N

B. M:1

D. 1:M

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  3. A ____ key specifies a uniqueness constraint that no two distinct tuples in any state r of relation…
  4. A table can have only one
  5. In an E-R diagram double lines indicate
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  7. The clause alter table in SQL can be used to
  8. Wait-for graph is used for
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  15. DBMS is a collection of _____ that enables user to create and maintain a database.
  16. An advantage of the database management approach is
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  18. The data models defined by ANSI/SPARC architecture are
  19. ______ keyword is used to find the number of values in a column.
  20. If an entity can belong to only one lower level entity then the constraint is
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  22. Relational Algebra is
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