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Please refer to the errata for this document, which may include normative corrections.

This document is also available in these non-normative formats: diff-marked HTML .

Transactions are protected (isolated) from each other while they are in progress; they cannot interfere with each other or see each other's uncommitted data.

This isolation is achieved through the , when they can be sure that the transactions really do not interfere with each other.

Growth and restructuring of base tables is not reflected in views. What is Data Model= This data model is based on real world that consists of basic objects called entities and of relationship among these objects. The constraint is for any two tuples t1 and t2 in r if t1[X] = t2[X] then they have t1[Y] = t2[Y].

Thus the view can insulate users from the effects of restructuring and growth in the database. Entities are described in a database by a set of attributes. What is Object Oriented model= This model is based on collection of objects. How does Tuple-oriented relational calculus differ from domain-oriented relational calculus The tuple-oriented calculus uses a tuple variables i.e., variable whose only permitted values are tuples of that relation. QUEL The domain-oriented calculus has domain variables i.e., variables that range over the underlying domains instead of over relation. This means the value of X component of a tuple uniquely determines the value of component Y. When is a functional dependency F said to be minimal= Multivalued dependency denoted by X Y specified on relation schema R, where X and Y are both subsets of R, specifies the following constraint on any relation r of R: if two tuples t1 and t2 exist in r such that t1[X] = t2[X] then t3 and t4 should also exist in r with the following properties = It is based on concept of full functional dependency.

This document has been reviewed by W3C Members, by software developers, and by other W3C groups and interested parties, and is endorsed by the Director as a W3C Recommendation.

When you assign it to 10 in the second line your value 10 is written into the memory location pointed to by x.

A database is a logically coherent collection of data with some inherent meaning, representing some aspect of real world and which is designed, built and populated with data for a specific purpose. What is DBMS= It is a collection of programs that enables user to create and maintain a database.

The English version of this specification is the only normative version. Copyright © 2009 XForms is an XML application that represents the next generation of forms for the Web.

XForms is not a free-standing document type, but is intended to be integrated into other markup languages, such as XHTML, ODF or SVG.

This document specifies a syntax created by subsetting an existing, widely used international text processing standard (Standard Generalized Markup Language, ISO 8886(E) as amended and corrected) for use on the World Wide Web.

It is a product of the XML Core Working Group as part of the XML Activity. As a convenience to readers, it incorporates the changes dictated by the accumulated errata (available at to the Fourth Edition of XML 1.0, dated 16 August 2006.