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Class 11th Chapter -9 Intdroductin to database management System.

  “Database is a collection of related data items stored in an organized manner". DBMS can be defined as system designed for efficient storage, maintenance and retrieval of data. In short the DBMS software is what makes database practical and more usable. As we are aware of terms data, information, database and database management system, l Introduction to Base Base is Relational Database Management System (RDBMS) as it follows relational model. the organization of data into collections of two-dimensional tables called “relations.” Designed by E.F. Codd, relational model is based on the theory of sets and relations of mathematics. Base is a collection of related data objects known as Tables, Queries, Reports and Application Modules. Table :- Tables are organized in the form of columns and rows. To decide what information would be stored in a table and what would be the column titles, database designer needs to first decide entities in database. Queries : A question asked within th

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