SQL is a language to operate databases; it includes database creation, deletion, fetching rows, modifying rows, etc. SQL is an ANSI (American National Standards Institute) standard language, but there are many different versions of the SQL language.
What is SQL?
SQL is Structured Query Language, which is a computer language for storing, manipulating and retrieving data stored in a relational database. SQL is the standard language for Relational Database System. All the Relational Database Management Systems (RDMS) like MySQL, MS Access, Oracle, Sybase, Informix, Postgres and SQL Server use SQL as their standard database language.
Also, they are using different dialects, such as −
- MS SQL Server using T-SQL,
- Oracle using PL/SQL,
- MS Access version of SQL is called JET SQL (native format) etc.
Why SQL?
SQL is widely popular because it offers the following advantages −
- Allows users to access data in the relational database management systems.
- Allows users to describe the data.
- Allows users to define the data in a database and manipulate that data.
- Allows to embed within other languages using SQL modules, libraries & pre-compilers.
- Allows users to create and drop databases and tables.
- Allows users to create view, stored procedure, functions in a database.
- Allows users to set permissions on tables, procedures and views.
A Brief History of SQL
- 1970 − Dr. Edgar F. “Ted” Codd of IBM is known as the father of relational databases. He described a relational model for databases.
- 1974 − Structured Query Language appeared.
- 1978 − IBM worked to develop Codd’s ideas and released a product named System/R.
- 1986 − IBM developed the first prototype of relational database and standardized by ANSI. The first relational database was released by Relational Software which later came to be known as Oracle.
SQL Process
When you are executing an SQL command for any RDBMS, the system determines the best way to carry out your request and SQL engine figures out how to interpret the task.
There are various components included in this process.
These components are −
- Query Dispatcher
- Optimization Engines
- Classic Query Engine
- SQL Query Engine, etc.
A classic query engine handles all the non-SQL queries, but a SQL query engine won’t handle logical files.
5 BASIC SQL commands?
There are five types of SQL commands: DDL, DML, DCL, TCL, and DQL.
- Data Definition Language (DDL) DDL changes the structure of the table like creating a table, deleting a table, altering a table, etc.
- Data Manipulation Language( select, insert, delete, update).
- Data Control Language(Grant Revoke).
- Transaction Control Language.
- Data Query Language.
MS SQL SERVER HISTORY & DESCRIPTION
MS SQL Server HISTORY AND DESCRIPTION
MS SQL Server is a Relational Database Management System developed by Microsoft Inc. Its primary query languages are −
- T-SQL
- ANSI SQL
History
- 1987 – Sybase releases SQL Server for UNIX.
- 1988 – Microsoft, Sybase, and Aston-Tate port SQL Server to OS/2.
- 1989 – Microsoft, Sybase, and Aston-Tate release SQL Server 1.0 for OS/2.
- 1990 – SQL Server 1.1 is released with support for Windows 3.0 clients.
- Aston – Tate drops out of SQL Server development.
- 2000 – Microsoft releases SQL Server 2000.
- 2001 – Microsoft releases XML for SQL Server Web Release 1 (download).
- 2002 – Microsoft releases SQLXML 2.0 (renamed from XML for SQL Server).
- 2002 – Microsoft releases SQLXML 3.0.
- 2005 – Microsoft releases SQL Server 2005 on November 7th, 2005.
Features
- High Performance
- High Availability
- Database mirroring
- Database snapshots
- CLR integration
- Service Broker
- DDL triggers
- Ranking functions
- Row version-based isolation levels
- XML integration
- TRY…CATCH
- Database Mail
MY SQL SERVER HISTORY AND DESCRIPTION
MySQL is the most popular open source relational MySQL database management system. MySQL is one of the best RDBMS used to build web-based software applications. MySQL is an open source SQL database, which is developed by a Swedish company – MySQL AB. MySQL is pronounced as “my ess-que-ell,” in contrast with SQL, pronounced “sequel. MySQL is supporting many different platforms including Microsoft Windows, the major Linux distributions, UNIX, and Mac OS X. MySQL has free and paid versions, depending on its usage (non-commercial/commercial) and features. MySQL comes with a very fast, multi-threaded, multi-user and robust SQL database server.
MySQL is easy to use and fast RDBMS being used for many small and big businesses. MySQL is developed marketed & supported by MySQL AB, which is a Swedish company. MySQL is becoming so popular because of many good reasons
- MySQL is released under an open source license. So you have nothing to pay to use it.
- MySQL is a very powerful program in its own right. It handles a large subset of the functionality of the most expensive and powerful database packages.
- MySQL uses a standard form of the well-known SQL data language.
- MySQL works on many operating systems and with many languages including PHP, PERL, C, C++, JAVA, etc.
- MySQL works very quickly and works well even with large data sets.
- MySQL is very friendly to PHP, the most appreciated language for web development.
- MySQL supports large databases, up to 50 million rows or more in a table. The default file size limit for a table is 4GB, but you can increase this (if your operating system can handle it) to a theoretical limit of 8 million terabytes (TB).
- MySQL is customizable. The open-source GPL license allows programmers to modify the MySQL software to fit their own specific environments.
History
- Development of MySQL by Michael Widenius & David Axmark beginning in 1994.
- First internal release on 23rd May 1995.
- Windows Version was released on the 8th January 1998 for Windows 95 and NT.
- Version 3.23: beta from June 2000, production release January 2001.
- Version 4.0: beta from August 2002, production release March 2003 (unions).
- Version 4.1: beta from June 2004, production release October 2004.
- Version 5.0: beta from March 2005, production release October 2005.
- Sun Microsystems acquired MySQL AB on the 26th February 2008.
- Version 5.1: production release 27th November 2008.
Features
- High Performance.
- High Availability.
- Scalability and Flexibility Run anything.
- Robust Transactional Support.
- Web and Data Warehouse Strengths.
- Strong Data Protection.
- Comprehensive Application Development.
- Management Ease.
- Open Source Freedom and 24 x 7 Support.
- Lowest Total Cost of Ownership.
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