1 -- https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_substring
3 SELECT SUBSTRING('Quadratically',5);
6 SELECT SUBSTRING('foobarbar' FROM 4);
9 SELECT SUBSTRING('Quadratically',5,6);
12 SELECT SUBSTRING('Sakila', -3);
15 SELECT SUBSTRING('Sakila', -5, 3);
18 SELECT SUBSTRING('Sakila' FROM -4 FOR 2);