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03 September, 2019

         Domain And Attribute

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it is important to appreciate the difference between in doman on the one hand and columns are attributes which are dropped from the domain on the other attributes represent the use of domains within relations to emphasize the distinctions we may get attributes name that are distinct from those of the underlying domains .
DOMAIN.     PART NUMBER    CHARACTER
DOMAIN      PART NAME         CHARACTER
DOMAIN      COLOR.                 CHARACTER
DOMAIN.     WEIGHT.               CHARACTER
DOMAIN.     LOCATION.           CHARACTER

RELATIONS PART

P#.                    :  DOMAIN PART_NUMBER
PNAME.          :  DOMAIN PART_NAME
COLOR.           :  DOMAIN COLOR
WEIGHT.         :  DOMAIN WEIGHT
CITY.                :. DOMAIN LOCATION

        DOMAIN ATTRIBUTES
B A PART OF RELATIONS SCHEMA IN WHICH 5 DOMAIN ( PART ,NUMBER PART NAME ,DOMAIN COLOR,DOMAIN WEIGHT, AND DOMAIN LOCATION )ONE OF RELATIONSHIP (P# , PNAME, COLOUR, WEIGHT, CITY ,)HAVE BEEN DECLARED .
EACH ATTRIBUTE IS SPECIFIED AS BEING DRAW FROM A CORRESPONDENT DOMAIN THE SCHEMA WRITTEN IN A HYPOTHETICAL DATA DEFINITION LANGUAGE.
We shall very often make use of a convention that allow us  to omit  the specification of the domain from in an attribute declaration if the attribute bears the same name however it is not allowed possible to do this.
we have a relation with three attribute but only two distinct domains .the meaning of tuple of the relations component is the major part include the minor part in the indicated quantity as an immediate component that two distinct domain and quantity.

Example illustrate another common convention date of generating distinct attributes name why prefixing a common domain name with distinct role name to indicated the district rule being played by that domain in each of its appearances.

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