5.1- Introduction To Relational Database Management & SQL
5.1- Introduction To Relational Database Management & SQL
SQL is a standard language for storing, manipulating and retrieving data in databases.
Our SQL tutorial will teach you how to use SQL in: MySQL, SQL Server, MS Access, Oracle, Sybase, Informix, Postgres, and other database systems.
Structured Query Language is a domain-specific language used in programming and designed for managing data held in a relational database management system (RDBMS), or for stream processing in a relational data stream management system (RDSMS). It is particularly useful in handling structured data, i.e. data incorporating relations among entities and variables.
SQL offers two main advantages over older read-write APIs such as ISAM or VSAM. Firstly, it introduced the concept of accessing many records with one single command. Secondly, it eliminates the need to specify how to reach a record, e.g. with or without an index.
Originally based upon relational algebra and tuple relational calculus, SQL consists of many types of statements,[6] which may be informally classed as sublanguages, commonly: a data query language (DQL),[a] a data definition language (DDL),a data control language (DCL), and a data manipulation language (DML). The scope of SQL includes data query, data manipulation (insert, update and delete), data definition (schema creation and modification), and data access control. Although SQL is essentially a declarative language (4GL), it also includes procedural elements.
SQL was one of the first commercial languages to use Edgar F. Codd’s relational model. The model was described in his influential 1970 paper, "A Relational Model of Data for Large Shared Data Banks". Despite not entirely adhering to the relational model as described by Codd, it became the most widely used database language.
SQL became a standard of the American National Standards Institute (ANSI) in 1986, and of the International Organization for Standardization (ISO) in 1987. Since then, the standard has been revised to include a larger set of features. Despite the existence of standards, most SQL code requires at least some changes before being ported to different database systems.
PLAYLIST:
Complete Playlist:
SQL - Structured Query Language By Using MSSQL In DBMS In Hindi
https://www.youtube.com/playlist?list=PLL8qj6F8dGlRlQgG60v1OxSZDmSaSbsHc
(English)SQL using Microsoft SQL Server | Microsoft Sql Server
https://www.youtube.com/playlist?list=PLL8qj6F8dGlSR00PnE-EMQ7PENd3raeMf
DBMS - Data Base Management System Tutorials | All University Exams - UGC NET- GATE DBMS Lectures
https://www.youtube.com/playlist?list=PLL8qj6F8dGlSZrqH37DY_4rsfeOkieH54
[With Notes & PDF File] | Database Management System In HINDI
https://www.youtube.com/playlist?list=PLL8qj6F8dGlSZYUFrX6ASTdFWiUlLjguc
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