A、SELECT SUBSTR( ‘Hello World’,1) FROM dual;
B、SELECT INITCAP(TRIM (‘Hello World’, 1,1)) FROM dual;
C、SELECT LOWER(SUBSTR(‘Hello World’, 1, 1) FROM dual;
D、SELECT LOWER(SUBSTR(‘Hello World’, 2, 1) FROM dual;
E、SELECT LOWER(TRIM (‘H’ FROM ‘Hello World’)) FROM dual