Relational Database: Union Compatibility Question - Programmers Heaven

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Relational Database: Union Compatibility Question


Hi,

According to one reference, the union compatibility is defined as
such:
(1)the two relations have the same degree n (number of attributes) ,
and (2) domain (Ai)= domain (Bi) for 1= thank you <:>

Comments

  • infidelinfidel Posts: 2,900Member
    : According to one reference, the union compatibility is defined as
    : such:
    : (1)the two relations have the same degree n (number of attributes) ,
    : and (2) domain (Ai)= domain (Bi) for 1= 0
    no rows returned
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