sql first 3 characters code example

Example 1: grab part of a string sql

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

Example 2: sql left characters

-- For Oracle only

-- syntax 
SUBSTR(<main-string>,1,<number-of-characters>)

-- example 
SUBSTR('Useless stuff',1,10) -- OUTPUT: Useless st

-- practical example
SELECT SUBSTR('Useless stuff',1,10)
FROM DUAL;