why is query expressed in relational algebra preferred over a query expressed in SQL
Answers
Answered by
0
Explanation:
In DDBMS, query optimization is a crucial task. The complexity is high since number of alternative strategies may increase exponentially due to the following factors −
The presence of a number of fragments.
Distribution of the fragments or tables across various sites.
The speed of communication links.
Disparity in local processing capabilities.
Similar questions