how does distinct work in sql code example

Example 1: select distinct

SELECT DISTINCT ma_colonne
FROM nom_du_tableau

Example 2: distinct in sql server

The SELECT DISTINCT statement is used to return only distinct (different) values.
Ex: select DISTINCT Country from TableName;

Example 3: query DISTINCT

SELECT DISTINCT Column_name FROM table_name;

Example 4: what is distinct in sql

Distinct: helps to displays the non duplicate
records when retrieving the records from a table.

SELECT DISTINCT FIRST_NAME FROM VISITORS;