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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;
Define the phases of two phase locking protocol Growing phase: a transaction may get locks but not release any lock. Shrinking phase: a transaction might be release locks bu
How to create values of structured type? Constructor functions are used to make values of structured types. A function with the similar name as a structured type is a construct
List the drawbacks of relational database system A) Repetition of data B) Inability to s certain information.
Describe Physical Data independence ? Physical Data Independence - It is capacity to modify the internal schema without having to change conceptual schema. Therefore, the exter
note on hashing technique
I need to Map an E-R diagram to a relational schema
i want help to complete my task
What is deadlock? Neither of the transaction can ever proceed with its normal implementation. This situation is known as deadlock.
Database Management Systems 1. Explain SQL Server 2000 Architecture with diagram. 2. Describe Second Normal and Third Normal Form. 3. Explain about query engine and stora
Multiple-mode locks : It offers two locks: exclusive locks and shared locks. But why do we require these two locks? There are a lot of transactions in the database system that neve
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