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Which operations need the participating relations to be union compatible?
A UNION, INTERSECTION and DIFFERENCE operations need the participating relations to be union compatible.
Express the following queries in SQL: (a) Write the SQL code that will create ALL the four tables given in the appendix. Your answer should not contain the primary key and
what is specialization?
Discuss the methods for a hash file to expand and shrink dynamically. What are the advantages and disadvantages of each? The hashing methods that permit dyanamic file expansi
Database systems have many opposite efforts ?
How external/conceptual mapping and conceptual /internal mapping is performed
Need a sample of a clinic database relationships
What are the benefits of decomposing a system? The benefits of decomposing a system into subsystems are that after decomposition, each individual component become smaller and e
Describe Participation Constraints? Participation Constraints - The participation constraint exacts whether the existence of an entity depends on its being related to another
Example: Consider the following relations: ROLLNO NAME ADDRESS COURSE_ID 100 Ka
WHAT IS MEANT BY E-R MODEL
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