how to select only first 3 characters in sql code example

Example 1: get first 3 letters in sql

SELECT FIRST_NAME ,  SUBSTR(FIRST_NAME, 1 , 3 ) , LENGTH(FIRST_NAME)
FROM EMPLOYEES ;

Example 2: sql server substring

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

Example 3: grab part of a string sql

SELECT SUBSTRING('SQLTutorial.org');