What is union how is it represented explain with example in database management system
Answers
Answered by
3
UNION is symbolized by symbol. It includes all tuples that are in tables A or in B. - Symbol denotes it. The result of A - B, is a relation which includes all tuples that are in A but not in B
Answered by
0
Relational algebra is a widely used procedural query language. It collects instances of relations as input and gives occurrences of relations as output. It uses various operation to perform this action.
Relational algebra operations are performed recursively on a relation. The output of these operations is a new relation, which might be formed from one or more
Similar questions