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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：
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
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