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ayisha siddika
Jun 15, 2022
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DDL is used to define and manage all the objects in an Brother Cell Phone List database. Such as creating Databases, creating security objects that define the whole database. [2] DML (Data Manipulation Language) Insertion, Update , Delete and Selection are the Brother Cell Phone List activities concerned with the database manipulation language. DML is used to Select, Insert, Update, and Delete data in the objects defined using DDL. [3] DCL ( Database Control Language) Database control language is concerned with the consistency maintaining, authorizing access and other control over the database. There are some other languages which must be known. These Brother Cell Phone List are - VDL (View Definition Language) : Providing means to view the conceptual schema of database for external level of three level schema. SDL (Storage Definition Language) : Providing Brother Cell Phone List means to change or modify the internal schema of the database. [8] Relational Database : The Relation database model is based upon the conception of implementing the database with the Mathematical Set Theory. In this model, data is collection of tables called Relation in the set theory. The Brother Cell Phone List Tabular representation of data contains rows and columns in which rows represent set of attributes of individual entity and the columns represent the attribute of entity. A model is Brother Cell Phone List also said as Relational Database Model, if it follows complete set of Rules defined by Dr. E.F. Codd. There are 12 Rules of Dr. Codd. In all of them, only Oracle is supposed to Brother Cell Phone List follow nearly all of them. But, the best in performance is Sybase which is more easier to configure that of Oracle. SQL : SQL is actually Structured Query Language. This is pronunciated as 'sequel', but 'Ess-Que-El' is also correct. It was initially named by Dr. E.F. Codd who named it Structured Brother Cell Phone List English Query Language (S E Que L ) as Sequel. SQL is based on the Relational Model. Nearly all the database implementation in the world are in Relational Model. Sybase ,SQL Server, Oracle, DB2 are the Brother Cell Phone List famous implementation of Relational Model. But these are also kept in the Category of Object Relational Model.
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