Free relational database pdf#

It can represent number with or without the fractional part. Values must be enclosed in single quotes or double quotes.ДЄ variable-length string between 1 and 255 characters in length for example VARCHAR(20). It determines what all changes are permissible to a database.ДЄ fixed-length string between 1 and 255 characters in length right-padded with spaces to the specified length when stored. O Integrity Constraints are the rules that a database must comply all the O A non-key attribute, whose values are derived from the primary key of O A candidate key that is not primary key is called alternate key. O A Candidate Key is the one that is capable of becoming Primary key i.e., aДЇield or attribute that has unique value for each row in the relation

O Set of one or more attributes that can uniquely identify tuples with in the O Virtual table that does not really exist in its own right but can be used to O Number of attributes(fields) in a relation O Pool of values from which the actual values appearing Identifiable entity with some characteristics and behavior. O Data and associated operations are represented by objects. O In this model records are organized as trees rather than arbitrary graphs. The collections of records are connected to one another by means of O In this model data are represented by collection of records & relationshipsДЄmong data. O In this model data is organized into tables i.e. O A file containing facts/data about the data stored in table O Facts/data about the data stored in table. (additions/deletions/modification) of data which residing in the database tables. O Part of the SQL that facilitates manipulation

ofДatabase object such as tables, indexes, sequences etc. O Part of the SQL that facilitates defining creation/modification etc. вњЇ Normalization Is a process of attaining good database design by вњЇ Object Oriented Data Model in this model objects represent the data andДЄssociated operations where an object is identifiable entity with some characteristics and вњЇ Hierarchical Data Model In this model records are organized in the form of Records and relationships among data are represented by links. вњЇ Network Data Model In this model the data is represented by collections of вњЇ Relational Data Model In this model the data is organized into tables called System that stores the data centrally and manages data efficiently. вњЇ Database Management System(DBMS) It is a computer based record keeping

Free relational database pdf#

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