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A constraint named less_than_20 was defined on the field date_of_birth of table student. Delete this constraint. ALTER TABLE student DROP CONSTRAINT less_than_20;
Design a gennalization and specialization hierarchy for an automobile sales company
What is DataWarehousing? Subject-oriented, meaning that the data in the database is organized so that all the data elements relating to the similar real-world event or object
Timestamps For Read operations: If TS (T) If TS (T) >= W-timestamp (Q), then the transaction T is trying to read a value of data item Q which has been written and committed
Explain weak and strong entity sets? Weak and Strong entity sets: A physically powerful entity set has a primary key. All tuples in the group are distinguishable through that k
When It is better to use files than a DBMS? It is better to use files than a DBMS when Multiple users wish to access the data.
What is trigger Triggers are statements that are implemented automatically by the system as the side effect of a change to the database.
Can a filed occur in several field groups. Yes. But it leads to redundant data redundancy.
What are the drawbacks of shadow-paging technique? The drawbacks of shadow paging is:- a) Commit Overhead b) Data fragmentation c) Garbage collection
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