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To delete a particular column in a relation which command is used ? To delete a particular column in a relation ALTER command is used.
What is a candidate key? Minimal super keys are known as candidate keys.
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
How many types of Views are there? There are Four types of views:- Database View Help View Projection View Maintenance View
multiplicity constarin
What are domain constraints? A domain is a set of values that might be assigned to an attribute .all values that appear in a column of a relation must be taken from the similar
what benefit can a company gain by managing its own infrasture and services
Eliminate Repeating Groups The problem is, "Find out the list of employees, who knows DB2". For this problem we require to perform an awkward scan of the list looking for re
Synonyms and Indexes Some of the essential properties of indexes are: An Index is a schema Object Indexes can be formed explicitly or automatically Indexes are m
Question: a) There are three concurrency problems, i.e. three types of potential mistake which could occur if concurrency control is not properly enforced in the database syst
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