OCP-1Z0-051-V9.02-89题

89. You need to display the date 11-oct-2007 in words as 'Eleventh of October, Two Thousand Seven'.

Which SQL statement would give the required result?

A. SELECT TO_CHAR('11-oct-2007', 'fmDdspth "of" Month, Year') 

FROM DUAL;

B. SELECT TO_CHAR(TO_DATE('11-oct-2007'), 'fmDdspth of month, year') 

FROM DUAL;

C. SELECT TO_CHAR(TO_DATE('11-oct-2007'), 'fmDdthsp "of" Month, Year')

FROM DUAL;

D. SELECT TO_DATE(TO_CHAR('11-oct-2007','fmDdspth ''of'' Month, Year'))  错。

FROM DUAL;

Answer: C

答案解析：

参考：http://blog.csdn.net/rlhua/article/details/12832885

A错误，'11-oct-2007'本来就是字符，就不用再to_char

B中'fmDdspth of month, year'的of需要用双引号引起来。

C正确。

D跟A一样的错误，'11-oct-2007'本来就是字符，就不用再to_char。

 

实验验证：

A,

scott@TEST0924> SELECT TO_CHAR('11-oct-2007', 'fmDdspth "of" Month, Year') FROM DUAL;

SELECT TO_CHAR('11-oct-2007', 'fmDdspth "of" Month, Year') FROM DUAL

               *

ERROR at line 1:

ORA-01722: invalid number

B

scott@TEST0924> SELECT TO_CHAR(TO_DATE('11-oct-2007'), 'fmDdspth of month, year') FROM DUAL;

SELECT TO_CHAR(TO_DATE('11-oct-2007'), 'fmDdspth of month, year') FROM DUAL

                                       *

ERROR at line 1:

ORA-01821: date format not recognized

C

scott@TEST0924> SELECT TO_CHAR(TO_DATE('11-oct-2007'), 'fmDdthsp "of" Month, Year') FROM DUAL;

TO_CHAR(TO_DATE('11-OCT-2007'),'FMDDTHS

---------------------------------------

Eleventh of October, Two Thousand Seven

D

scott@TEST0924> SELECT TO_DATE(TO_CHAR('11-oct-2007','fmDdspth ''of'' Month, Year')) FROM DUAL;

SELECT TO_DATE(TO_CHAR('11-oct-2007','fmDdspth ''of'' Month, Year')) FROM DUAL

                       *

ERROR at line 1:

ORA-01722: invalid number