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hass, Database Management System
waht is a repeating group?
Posted Date: 3/8/2013 11:13:41 AM | Location : Sri Lanka
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explain three types of internet risks to the consummers whent he business system is data dependent. how can we minimise these risks
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Timestamps For Read operations: If TS (T) If TS (T) >= W-timestamp (Q), then the transaction T is trying to read a value of data item Q which has been written and committed
Explain data sublangauges, Explain Data Sublangauges ? Data sublanguage...
Explain Data Sublangauges ? Data sublanguage: In relational database theory, the term sublanguage, first used for this purpose through E. F. Codd in the year of 1970, refers t
In a relational model how relations are termed, In a relational model how r...
In a relational model how relations are termed? In a relational model, relations are termed as tables. (The term ‘relation’ is the technical name of the ‘table’ in RDBMS)
Project on designing and creating a database , This project will involve de...
This project will involve designing and creating a database for an organization. In the design of a database, there is no single "perfect" design. So your database design may not
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Explain entity integrity and referential integrity rules within relational model. Show how these are realized in SQL? Entity Integrity Rule - No primary key value could be nu
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List the data structures implemented by the storage manager. The storage manager executes the following data structure a) Data files b) Data dictionary c) indices
Super keys, A super key is an attribute or set of attributes used to recogn...
A super key is an attribute or set of attributes used to recognize the records uniquely in a relation. For instance, in the Relation PERSON defines earlier PERSON_ID is a super
What is a view, What is a view? Make a view of EMP table named DEPT 20, to...
What is a view? Make a view of EMP table named DEPT 20, to display the employees in department 20 and their annual salary. Ans: View is a virtual table that does not consist
Give expression in both tuple calculus and domain calculus, Consider the fo...
Consider the following relational schema: Doctor(DName,Reg_no) Patient(Pname, Disease) Assigned_To (Pname,Dname) Give expression in both Tuple calculus and Domain calculus for
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