Junior — Middle

Can you explain what is meant by the DDL industry in the context of working with databases?

sobes.tech AI

Answer from AI

DDL (Data Definition Language) is a subset of SQL used for defining and modifying the structure of a database. In the context of working with databases, DDL includes commands that create, modify, and delete database objects such as tables, indexes, schemas, etc.

Main DDL commands:

CREATE — creating new objects (e.g., tables).
ALTER — modifying the structure of existing objects.
DROP — deleting objects from the database.
TRUNCATE — quickly clearing a table of data.

Example of creating a table:

CREATE TABLE users (
    id INT PRIMARY KEY,
    username VARCHAR(50) NOT NULL,
    email VARCHAR(100)
);

Thus, DDL is responsible for the database structure, unlike DML (Data Manipulation Language), which works with data inside these structures.

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