Data Manipulation Language (DML):Definition of DML.Examples of DML commands (SELECT, INSERT, UPDATE, DELETE).Demonstrations of how DML commands are used to retrieve, insert, update, and delete data in a database.

Data Manipulation Language (DML) is a type of language used in SQL that allows users to manipulate and control data in a database. This includes retrieving, inserting, updating, and deleting data.

Examples of DML commands include:

1. SELECT: This command is used to select data from a database. The data returned is stored in a result table, called the result-set.

Example:

SELECT column1, column2, ...
FROM table_name;

This SQL statement selects the "column1", "column2", ... from the "table_name" table.

2. INSERT: This command is used to insert new data into a database.

Example:

INSERT INTO table_name (column1, column2, column3, ...)
VALUES (value1, value2, value3, ...);

This SQL statement will insert into "table_name" in columns "column1", "column2", "column3", ... the values "value1", "value2", "value3", ...

3. UPDATE: This command is used to modify the existing records in a database.

Example:

UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;

This SQL statement updates the "table_name" set "column1" = "value1", "column2" = "value2", ... where some condition is true.

4. DELETE: This command is used to delete existing records in a database.

Example:

DELETE FROM table_name WHERE condition;

This SQL statement deletes from "table_name" where the same condition is true.