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database relational model, Database Management System
what do you mean by primary key constraint?
Posted Date: 7/26/2012 7:04:55 AM | Location : United States
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What are stored and derived attributes, What are stored and derived attribu...
What are stored and derived attributes? Stored attributes: The attributes keeps in a data base are known as stored attributes. Derived attributes: The attributes that are de
What is a virtual table that draws its data from the result, What is a virt...
What is a virtual table that draws its data from the result of an SQL SELECT statement? View is a virtual table that draws its data from the result of an SQL SELECT statement.
Data integrity, You are required to implement integrity constraints within ...
You are required to implement integrity constraints within the database to enforce the following requirements: For Projects: Start date must be supplied. Start date cannot be i
When are two schedules said to be view equivalent, When are two schedules s...
When are two schedules said to be view equivalent? Ans: Two schedules that is denoted as S and S' are said to be view equivalent if the subsequent three conditions are met
Develop a team database, I need a professional to prepare a database to co...
I need a professional to prepare a database to collect and store basic information. The information can be basic info such as contact details etc. One requirement i have is f
Database life cycle, Enumerate or state the steps in creating a relevant da...
Enumerate or state the steps in creating a relevant database of a shop.
Improved availability, Improved availability: The data in a distributed sys...
Improved availability: The data in a distributed system may be replicated so that it is at more than one site. Thus, the failure of a node or a communication link does not necessar
How to control as concurrent tasks, Control as Concurrent Tasks The ex...
Control as Concurrent Tasks The expression control as simultaneous task means applying control for those events of object which can happen simultaneously. An object can be imp
Draw the dependency diagram for the relation, Consider the subsequent relat...
Consider the subsequent relation Professor (Pfcode, dept, head, time) It is assumed that (i) A professor can work in much more than one
Explain trigger, What is Trigger? A trigger is a SQL procedure that ini...
What is Trigger? A trigger is a SQL procedure that initiates an action when an event (INSERT, DELETE or UPDATE) occurs. Triggers are kept in and managed by the DBMS. Triggers a
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