SQL

SQL (Structured Query Language) is the standard language for managing and manipulating data in relational database management systems (RDBMS).

SQL, or Structured Query Language, is the essential tool for handling structured data: it’s the standard for RDBMS. Use it to execute core data operations: `SELECT` to retrieve specific records, `INSERT` to add new rows, `UPDATE` to modify existing data, and `DELETE` to remove it. This language is critical across all major platforms (MySQL, PostgreSQL, Microsoft SQL Server, Oracle), ensuring data integrity and enabling complex joins across multiple tables. Every data professional needs fluency in SQL; it’s the bedrock of modern data management.

https://www.w3schools.com/sql/default.asp