Relational database

Relational database

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  Relational Database Management System IN HINDI OMega TechEd
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  Relational Database. Relational DatabaseManagement System. Database Languages. OMega TechEd
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  Relational Database OMega TechEd
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  Relational Database A RelationalDatabase is a collection of data items which are organized in the form of tables of information, which can be easily accessed. This concept was introduced by E.F.Codd a researcher at IBM in 1970 . In Relational Databases the data is stored using rows and columns in the form of a table. Name Age City Salary Santosh 29 Mumbai 34500 Rupali 30 Pune 30000 Kalpana 45 Delhi 50000 Monali 28 Surat 35000 Hemant 41 Mumbai 55000 OMega TechEd
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  Employee Name Salary Age City Emp_idName Salary Age City 101 Kavita 18800 21 Mumbai 102 Piyush 21000 23 Pune Employee Table: Relation Columns: Attributes Rows: Entities OMega TechEd Emp_id
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  Relation, Entities andAttributes. Relation : Table which contains rows and columns of related data. 1 Entities (Rows) : They are items about which some relevant information is stored in the database. 2 Attributes (Columns) : They are the qualities of an entity that are stored as information. 3 OMega TechEd
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  Relationship A relationship isa connection between the data stored in one relational database table and another. Stock_id Supp_id Stock_name clstock 1301 001 Soap 234 1102 002 Shampoo 153 1203 003 Toothpaste 105 Supp_id Supp_name Phone_no 001 Hiten & Co. 9914326571 002 Manu & Co. 8114456572 003 Raj & Co. 9942156992 Stock Table Supplier Table OMega TechEd
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  Join  A joinis a connection between two tables where the data from them is merged together based on a field (column) that is common to these tables, creating a new virtual table.  To create a join it is necessary that the tables have a relationship. Stock_id Supp_id Stock_name Supp_name Phone_no. 1301 001 Soap Hiten & Co. 9914326571 1102 002 Shampoo Manu & Co. 8114456572 1203 003 Toothpaste Raj & Co. 9942156992 OMega TechEd
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  Relational Database Management System OMegaTechEd
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  Relational Database Management System. TheSoftware that is used with Relational database is called a Relational Database Management System (RDBMS). Examples: MY SQL, MS-ACCESS etc. OMega TechEd
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  Database Languages OMega TechEd
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  • This languageis used by the designer and programmers of the database to indicate the content and structure of the database. Data Definition Language (DDL) • This language is used primarily for data manipulation and processing. It involves retrieving the data, arranging the data deleting the data and displaying the data etc. Data Manipulation Language (DML) OMega TechEd
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  • This isused for controlling the data and access to the database. It is used to address security issues and restrict the access to the database. Data Control Language (DCL) • TCL is used to run the changes made by the DML statement. TCL can be grouped into a logical transaction. Transaction Control Language (TCL) OMega TechEd
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  Summary  RDBMS applicationsstore data in a tabular form.  Attributes describe the characteristics or properties of an entity in a database table (Relation).  A JOIN is used to combine rows from two or more tables, based on a related column between them.  DDL is used for specifying the database schema.  DML is used for accessing and manipulating data in a database.  DCL is used for granting and revoking user access on a database.  The changes in the database that we made using DML commands are either performed or rollbacked using TCL. OMega TechEd
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  If you havea question, you can reach me via e-mail at omega.teched@gmail.com Social Media Handles: omega.teched megha_with megha-sharma24 OMega TechEd