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STRUCTURED QUERY LANGUAGE (SQL)

STRUCTURED QUERY LANGUAGE:

SQL is a language used for getting information when used from a database and even updating the information from a database. SQL is certified by both American National Standard Institute and ISO standard and much of the database products support SQL. It is a Data Sub Language and used by a combination of two languages. They are: Data Definition Language (DDL) and Data Manipulation Language (DML) and the main way to access data are by using a DML command.

SQL language was created in the IBM laboratories where new software was created and it is called System R. So in order to manage the entire data which is stored in System R the SQL language was created. Before SQL was named as SEQUEL and later it was renamed it as SQL.
SQL widely supports users who are using distributed databases because it can run on different computer networks. SQL serves both industry and academic needs. With more advancement of the database technology SQL applications are used for their regular use. For example: MySQL, SQLite, PostgreSQL and Oracle. SQL developers develop some commands to the corresponding database management systems and it is usually executed by a SQL command-line interface (CLI). It uses a set of commands like Insert, select, update, delete, create and drop.

SELECT COMMAND: The SQL SELECT command is used to select data from a given SQL DATABASE. It is used to retrieve data from a given database. So in order to create a SQL SELECT, we need to specify both column name and table name and the whole process is called a SQL SELECT statement. In order to apply for specific conditions the operator uses certain signs like:
= - Equal
< - Less than
> - Greater than
≤ - Less than or equal
≥- Greater than or equal - Not equal
Example:
|customer_id

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