SQL (Structured Query Language) is a programming language used for managing and accessing data stored in relational databases. It is a standard language for working with relational databases, and it is used by many popular database management systems, such as MySQL, Oracle, and Microsoft SQL Server.
SQL is used to create, update, and query databases, as well as to manage database users and permissions. It is a powerful and versatile language that is essential for anyone working with large datasets.
SQL uses a set of commands, known as SQL queries, to interact with the database. These queries allow users to retrieve, insert, update, or delete data from the database. SQL queries are written in a specific syntax that follows certain rules and conventions. This syntax is designed to make it easy for users to read and understand SQL queries, and it is similar to the syntax of other programming languages.
Some examples of common SQL queries include:
- SELECT: retrieves data from one or more tables in the database
- INSERT: adds new records to a table
- UPDATE: modifies existing records in a table
- DELETE: removes records from a table
These are just a few examples of the many different types of SQL queries that are used to interact with databases. SQL is a powerful and flexible language that is widely used in many different industries, including finance, healthcare, retail, and more.