Editing Technology/Software Development/General knowledge/Databases and SQL (section)

== SQL: Structured Query Language ==
'''Definition'''

Structured Query Language (SQL) is a standard language for managing and manipulating relational databases. It provides a set of commands and syntax for creating, modifying, querying, and managing data in a relational database management system (RDBMS).

'''Common SQL Operations'''

Let's explore some common SQL operations used for interacting with databases:

1. '''Creating a Table:'''

* SQL allows you to define the structure of a table using the CREATE TABLE statement.

* You specify the table name, column names, and their data types, along with any constraints.

2. '''Inserting Data:'''

* The INSERT statement is used to add data into a table.

* You specify the table name and provide the values for each column in the INSERT statement.

3. '''Querying Data:'''

* SQL provides the SELECT statement to query and retrieve data from one or more tables.

* You can specify conditions, sort the results, and retrieve specific columns or aggregate data using functions.

4. '''Updating Data:'''

* The UPDATE statement is used to modify existing data in a table.

* You specify the table name, set the new values for the desired columns, and apply any necessary conditions.

5. '''Deleting Data:'''

* The DELETE statement allows you to remove data from a table based on specified conditions.

* You specify the table name and conditions that determine which rows to delete.

6. '''Joining Tables:'''

* SQL supports various types of joins to combine data from multiple tables based on a related column or key.

* Join operations include INNER JOIN, LEFT JOIN, RIGHT JOIN, and OUTER JOIN.