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