SQL Training

SQL is responsible for querying and editing information stored in a certain database management system. is a special-purpose programming language designed for managing data held in a relational database management system (RDBMS), or for stream processing in a relational data stream management system (RDSMS).

SQL consists of a data definition language and a data manipulation language. The scope of SQL includes data insert, query, update and delete, schema creation and modification, and data access control. Although SQL is often described as, and to a great extent is, a declarative language (4GL), it also includes procedural elements.

QL is a declarative programming language designed for creating and querying relational database management systems. SQL is relatively simple language, but it’s also very powerful.

SQL can insert data into database tables. SQL can modify data in existing database tables. SQL can delete data from SQL database tables. Finally SQL can modify the database structure itself – create/modify/delete tables and other database objects.

SQL uses set of commands to manipulate the data in relational databases. For example SQL INSERT is used to insert data in database tables. SQL SELECT command is used to retrieve data from one or more database tables. SQL UPDATE is used to modify existing database records.

Structured query language, and pronounced either see-kwell or as separate letters. SQL is a standardized query language for requesting information from a database. The original version called SEQUEL (structured English query language) was designed by an IBM research centre in 1974 and 1975. SQL was first introduced as a commercial database system in 1979 by Oracle Corporation.

Historically, SQL has been the favorite query language for database management systems running on minicomputers and mainframes. Increasingly, however, SQL is being supported by PC database systems because it supports distributed databases (databases that are spread out over several computer systems). This enables several users on a local-area network to access the same database simultaneously.

Although there are different dialects of SQL, it is nevertheless the closest thing to a standard query language that currently exists. In 1986, ANSI approved a rudimentary version of SQL as the official standard, but most versions of SQL since then have included many extensionsto the ANSI standard. In 1991, ANSI updated the standard. The new standard is known as SAG SQL.