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In a relation, tuples are not inserted in any definite order. Ordering of tuples is not defined as a part of a relation definition. Though, records may be structured later according to some attribute value in the storage systems. For instance, records in PERSON table may be structured according to PERSON_ID. Such organisation or data depends on the requirement of the underlying database application. Though, for the purpose of display we may get them displayed in the sorted order of age. The following table is sorted by age. It is also worth states here that relational model does not permit duplicate tuples
PERSON
PERSON_ID NAME AGE ADDRESS
2 Sharad Gupta 33 Pocket 2, Mayur Vihar.
1 Sanjay Prasad 35 b-4,Modi Nagar
3 Vibhu Datt 36 c-2, New Delhi
Super Keys, Candidate Keys and Primary Keys for the Relations
As discussed in the last section ordering of relations does not matter and all tuples in a relation are unique. Though, can we uniquely recognize a tuple in a relation? Let us talk about the concepts of keys that are primarily used for the purpose as above.
What is the aim of object design The aim of object design is to identify object which the system contains and the interactions among them. The system implements specification
Hi is anyone well versed in accounting information systems available now to help me work through an important assignment due tomorrow at noon?
ER diagram on cosmetics
Determine the Disadvantages of file based systems Some of the disadvantages of file based systems are like this: Data redundancy and inconsistency: the dissimilar applic
What is a database? Database - Basically in simple terms A database is a collection of inter related data and/or information stored so which it is available to several users
waht is a repeating group?
Can a filed occur in several field groups. Yes. But it leads to redundant data redundancy.
Describe integrity constraints? Integrity Constraints - A database is just as excellent as the information stored in it, and a DBMS must therefore help avoid the entry of inc
what do you mean by consistency in rdbms?
Define object-relational systems? Systems that give object-oriented extensions to relational systems are known as object-relational systems.
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