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define normalisation and functional dependency
Consider the relation PERSON. If you want to display details of persons having age less than or equal to 30 than the select operation will be used as follows: σ AGE The resu
Objectives Define the terms RECOVERY and INTEGRITY; Define Recovery Techniques; Explain Error and Error detection techniques, and Define types of Authorisation.
What is serializability? Explain its types? The data base system must control concurrent implementation of transactions, to ensure that the data base state remains consistent.
Consider employee (e_no, e_name, e_salary, d_code), dept (d_code, d_name) and dependent (depndt_name, e_no, relation). Show the names of employees in purchase and accounts departm
differences between a classified catalog and a dictionary catalog
Describe relational model? Structure of relational data base Basic structure Database schema Keys Schema diagram Query languages
Give the general form of SQL query? Select A1, A2............., An From R1, R2..............., Rm Where P
A basic model of Database Access Control Models of database access control have grown out of previous work on protection in operating systems. Let us talk about one simple mode
Which component is not included in database environment ? A users component is not included in database environment.
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