What Is SQL?

• Structured Query Language

• A standard interactive and programming language for getting information from and updating a relational database.

• A relational database is composed of tables of data composed of typed columns.

• A row in a table is an n-tuple of data, for example:

       <pet_name, owner, species, sex, birth_date, death_date>  

• The collection of rows in a table constitutes a relation.

• Queries take the form of a command language that lets you select, insert, and update data in a table.