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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/12832885A错误，'11-oct-2007'本来就是字符，就不用再to_charB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
Bscott@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
Cscott@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 SevenDscott@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
           

分享一下我老师大神的人工智能教程。零基础！通俗易懂！风趣幽默！还带黄段子！希望你也加入到我们人工智能的队伍中来！https://blog.csdn.net/jiangjunshow