SQL (Structured Query Language) is a specialized programming language which is standardized to be used for maintaining relational databases and implementing various operations on the data. SQL became standard programming language for relational databases after they emerged in the late 1970s and early 1980s.
The uses of SQL include data integration scripts - write data integration scripts by the database administrators and developers; analytical queries - use structured query language for setting and running analytical queries on a regular basis; retrieve information - retrieve the subsets of information within a database for analytics applications and transaction processing; and the most commonly used SQL elements are select, insert, update, add, delete, create, truncate and alter.
Other important application of SQL is used for modifying the index structures and database table. Moreover, the users can add, update and delete the rows of the data by using this language.
SQL commands are composed of several different types, including data manipulation language (DML) and data definition language (DDL) statements, transaction controls, and security measures. The DML is used to retrieve and manipulate data. The DDL statements are for defining and modifying database structures. The transaction controls help manage transaction processing, ensuring that transactions are either completed or rolled back if errors or problems occur. The security statements are used to control database access as well as to create user roles and permissions.
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