What is SQL?

Options

1. Structured Query Language, to read and change data in relational DBs (Correct option)
2. Simple Quick Language, which is used to design web pages
3. Server Query Link, which is a kind of cable for networks
4. Software Quality Layer, which is a tool for testing programs

Answer

Structured Query Language: the language used to read and change data in relational databases

Why

SQL (Structured Query Language) is the standard way to talk to a relational database.

Example: SELECT name FROM users WHERE age > 30; asks for the names of users older than 30.

The main commands: SELECT (read), INSERT (add), UPDATE (change), DELETE (remove).

Remember

SQL = the language of relational databases.

Key terms

• SQL
• Query
• Relational database
• SELECT / WHERE / HAVING / ORDER BY
• Database