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Describe the GRANT function and explain, how it associates to security. What kind of privileges may be granted? How are they revoked?
Ans: Since more than one user can aaccess one database, there exists the required to restrict user from using whole database in any way. Setting up access privilege can do this. Any privilege can be granted to or revoked from user along with taken of the GRANT and REVOKE statements. Each privilege could be granted or revoked individually or in a group. Such group of rights is known as ROLE and rights can be granted or revoked within in the similar way as to the user. Access privileges include SELECT, INSERT, UPDATE and DELETE.
GRANT {statement|role_name} ON {object_name} TO {user|role_name_2} [WITH GRANT OPTION]
An example of granting permission to user B for reading EMP table is:
GRANT SELECT ON emp to B;
The REVOKE statement is used to revoke the permissions from the user. The syntax for REVOKE statement is given as: REVOKE {statement|role_name} FROM {user|role_name};
Domain Constraint It shows that each attribute in a relation has to contain an atomic value only from the corresponding domains. The data types associated with commercial RDBMS
3NF Normal Form A relation schema R is in 3NF if it is in 2NF and for each FD X A either of the following is true X is a Super-key of R. A is a prime attribute of R
It is mandatory that for every table in the LDB hierarchy there should exist one GET statement in the report. False. It is not essential.
In the first unit of this block, you have been given with the details of the Database Management System, its structure, advantages etc. This unit is an attempt to give you informat
Write an sql statement to find what is the percentage of home policies which are from the state of Arizona out of all Home policies by Policy Value.
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Desirable Properties Of Decomposition Decomposition is a process of dividing a relation into its projections that will not be disjoint. Please remind the Relational projection
Explain retrieval in QBE? Retrieval in QBE : A "GUI" for expressing queries. Based on the Domain Relational Calculus (DRC) Actually invented before GUIs. Very co
Strong entity set and weak entity set? Strong entity set and weak entity set: A strong entity set has a primary key. All tuples in the set are distinguishable through that key.
Create a new user : CREATE USER IDENTIFIED BY Example: //CREATE USER MCA12 IDENTIFIED BY W123 Grant: It is used to give database access permission to users. It is of
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