"Unioncompatible" means that the .
A)names of the relation attributes can be different,but the data types must be alike
B)names of the relation attributes must be the same,but the data types can be different
C)names of the relation attributes must be the same and their data types must be alike
D)number of attributes must be the same,but the names and data types can be different

Question

"Union­compatible" means that the .
A)names of the relation attributes can be different,but the data types must be alike
B)names of the relation attributes must be the same,but the data types can be different
C)names of the relation attributes must be the same and their data types must be alike
D)number of attributes must be the same,but the names and data types can be different

Quizplus · Accepted Answer

For two relations to be union-compatible, the names of the attributes must be the same, and their data types must also be the same. This is because when two relations are combined using the union operation, the resulting relation should have consistent attribute names and types. Therefore, option C is the correct answer.

"Union­compatible" Means That the

"Unioncompatible" Means That the