19. Evaluate the following query:
SELECT INTERVAL '300' MONTH,
INTERVAL '54-2' YEAR TO MONTH,
INTERVAL '11:12:10.1234567' HOUR TO SECOND
FROM dual;
What is the correct output of the above query?
A. +25-00 , +54-02, +00 11:12:10.123457
B. +00-300, +54-02, +00 11:12:10.123457
C. +25-00 , +00-650, +00 11:12:10.123457
D. +00-300 , +00-650, +00 11:12:10.123457
Answer: A
答案解析：
实验验证：
sys@TEST0924> SELECT INTERVAL '300' MONTH, INTERVAL '54-2' YEAR TO MONTH,INTERVAL '11:12:10.1234567' HOUR TO SECOND FROM dual;
INTERVAL'300'MONTH
---------------------------------------------------------------------------
INTERVAL'54-2'YEARTOMONTH
---------------------------------------------------------------------------
INTERVAL'11:12:10.1234567'HOURTOSECOND
---------------------------------------------------------------------------
+25-00
+54-02
+00 11:12:10.123457