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Describe integrity and security?
a) Domain constraint
b) Referential integrity
A value that appears in one relation for a given set of attributes also appear for a particular set of attributes in another relation. This condition is known as referential integrity.
a) Referential integrity and E-R models
b) Database modification
c) Referential integrity in SQL
Define Direct file organization? The direct file organization is employed to enhance the performance in accessing the records than sequential file organization. In direct file
What are the disadvantages of relational approach? Disadvantages of relational approach: • Substantial hardware and system software overhead • May not fit all business models •
(a) Design a query plan for the following distributed query: An application at site B wants to compute a join of STUDENT ? Id=StudId TRANSCRIPT where STUDENT (Id,Major) is at site
Question : (a) Differentiate between database integrity and database security (b) Database security involves measures to avoid loss of privacy and loss of confidentiality. D
Let consider the given partial relation EMP. Let us make some sub-queries for them EMPNO ENAME JOB SAL DEPTNO 7566
DROP TABLE Command: When an existing object is not needed for further use, it is always better to eliminate it from the database. To remove the existing object from the databas
What are the reasons for having variable length records? What are the various ways to store variable length records? Variable-length records arise in a database in various wa
Control Files : The redo and control files logs support the rest of the architecture. Every database must have at least one control file, although you have more than one to guard
Develop Database academic assignment Project Description: For a provided set of instructions in a case study design Entity Relationship Diagram. - Entity Relationship Diag
What is D command work in the respect of QBE? D: It is the command inside QBE to delete tuple(s) from the relation.
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