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08 April, 2022

Multivalued Dependency

 Programing Coderfunda     April 08, 2022     DBMS     No comments   

 

Multivalued Dependency

  • Multivalued dependency occurs when two attributes in a table are independent of each other but, both depend on a third attribute.
  • A multivalued dependency consists of at least two attributes that are dependent on a third attribute that's why it always requires at least three attributes.

Example: Suppose there is a bike manufacturer company that produces two colors(white and black) of each model every year.

BIKE_MODELMANUF_YEARCOLOR
M20112008White
M20012008Black
M30012013White
M30012013Black
M40062017White
M40062017Black

Here columns COLOR and MANUF_YEAR are dependent on BIKE_MODEL and independent of each other.

In this case, these two columns can be called multivalued dependent on BIKE_MODEL. The representation of these dependencies is shown below:

  1. BIKE_MODEL   →  →  MANUF_YEAR  
  2. BIKE_MODEL   →  →  COLOR  

This can be read as "BIKE_MODEL multidetermined MANUF_YEAR" and "BIKE_MODEL multidetermined COLOR".

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