sql substring

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

1-- substr(string, start, [, length ])
2SELECT substr('Hello World', 1, 3) ;      -- Hel
3SELECT substr('Hello World', 4, 5) ;      -- lo Wo
4SELECT substr('Hello World', 4);          -- lo World
5SELECT substr('Hello World', -3);         -- rld

1SUBSTRING(string, start, length)

1SELECT 
2    SUBSTRING('SQLTutorial.org',
3        POSITION('.' IN 'SQLTutorial.org'));

1SELECT SUBSTR(first_name, 0 , 3)
2From employees;

1SELECT SUBSTRING('SQLTutorial.org');