SQL ET POSTGRE 3.13 : Data definition language

The Data Definition Language (LDD) is a set of rules and conventions used to describe the structure and characteristics of data stored in a database. The LDD is used to define tables, fields, integrity constraints and relationships between tables. It is used to create database schemas and to ensure the consistency of stored data. In terms of SEO, the LDD is important because it allows search engines to understand the structure and meaning of the data stored in a database. This can help improve the relevance and quality of search results for users. LDD is also important for database optimisation and performance management. By using standardised rules and conventions, developers can create efficient and optimised databases that can be easily maintained and updated. Ultimately, LDD is a key component of data management and performance optimisation. By using LDD best practices, organisations can ensure that their databases are efficient, consistent and easy to use, which can result in a better user experience and more relevant search results.