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  • OCP-1Z0-新051-61题版本-39

    QUESTION NO: 39

    You need to calculate the number of days from 1st Jan 2007 till date:

    Dates are stored in the default format of dd-mm-rr.

    Which two SQL statements would give the required output? (Choose two.)

    A. SELECT SYSDATE - TO_DATE('01/JANUARY/2007') FROM DUAL;

    B. SELECT TO_DATE(SYSDATE,'DD/MONTH/YYYY')-'01/JANUARY/2007' FROM DUAL;

    C. SELECT SYSDATE - TO_DATE('01-JANUARY-2007') FROM DUAL

    D. SELECT SYSDATE - '01-JAN-2007' FROM DUAL

    E. SELECT TO_CHAR(SYSDATE,'DD-MON-YYYY')-'01-JAN-2007' FROM DUAL;

    Answer: A,C

    答案解析:

    参考:88:http://blog.csdn.net/rlhua/article/details/12859371

    hr@TESTDB>SELECT SYSDATE - TO_DATE('01/JANUARY/2007') FROM DUAL;


    SYSDATE-TO_DATE('01/JANUARY/2007')

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

                            2553.97258


    hr@TESTDB>SELECT TO_DATE(SYSDATE,'DD/MONTH/YYYY')-'01/JANUARY/2007' FROM DUAL;

    SELECT TO_DATE(SYSDATE,'DD/MONTH/YYYY')-'01/JANUARY/2007' FROM DUAL

                                            *

    ERROR at line 1:

    ORA-01722: invalid number



    hr@TESTDB>SELECT SYSDATE - TO_DATE('01-JANUARY-2007') FROM DUAL;


    SYSDATE-TO_DATE('01-JANUARY-2007')

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

                            2553.97277


    hr@TESTDB>SELECT SYSDATE - '01-JAN-2007' FROM DUAL;

    SELECT SYSDATE - '01-JAN-2007' FROM DUAL

                     *

    ERROR at line 1:

    ORA-01722: invalid number



    hr@TESTDB>SELECT TO_CHAR(SYSDATE,'DD-MON-YYYY')-'01-JAN-2007' FROM DUAL;

    SELECT TO_CHAR(SYSDATE,'DD-MON-YYYY')-'01-JAN-2007' FROM DUAL

           *

    ERROR at line 1:

    ORA-01722: invalid number

    Explanation: 

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  • 原文地址:https://www.cnblogs.com/hzcya1995/p/13316208.html
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