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One-way Associations
When an association is traversed only in the one direction, then it is implemented as a pointer i.e.an attribute which contains an object reference. If multiplicity is 'one' as shown in Figure, then it is simple pointer, otherwise it is a set of pointers.
Figure: Implementation of a one-way association using pointers
Find out the names of all employees who work for first Bank Corporation from database. SELECT EMPLOYEE_NAME FROM WORKS WHERE COMPANYNAME = ‘First Bank Corporation';
Wait-die" scheme : The idea is based on non-preventive method. It is based on a simple rule: If Ti requests a database resource that is held by T
Define Timestamp ordering Ans In timestamp-based method, a serial order is made among the concurrent transaction by assigning to every transaction a unique nondecreasing number
What is a super key? A super key is a set of one or more attributes that collectively permits us to recognize uniquely an entity in the entity set.
List some instances of collection types? a) sets b) arrays c) multisets
Java program for horrizontal fragmentation in distributed database
Determine the language that needs a user to specify the data to be retrieved with no specifying exactly how to get it is Ans: Non-Procedural DML
East Coast Aquarium Relational Database
project on dbms
Consider the following database schema: STAFF(StaffNo, fName, lName, Position, sex, dob, branchNo) BRANCH(BranchNo, Street, City) Assume the following for the above database
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