how substring works in sql code example

Example 1: sql server substring

SELECT SUBSTRING('SQL Tutorial', 1, 3) AS ExtractString;

Example 2: grab part of a string sql

SELECT 
    SUBSTRING('SQLTutorial.org',
        POSITION('.' IN 'SQLTutorial.org'));

Example 3: substring sql

SELECT SUBSTR(first_name, 0 , 3)
From employees;

Example 4: grab part of a string sql

SELECT SUBSTRING('SQLTutorial.org');