If an implicit conversion takes place

Hi all

I have two queries tell

SQL > SELECT * FROM EMP WHERE HIREDATE BETWEEN February 20, 81 'AND February 20, 82';

EMPNO, ENAME, JOB HIREDATE DEPTNO COMM SAL MGR
----- ---------- --------- ---------- --------- ---------- ---------- ----------
7499 ALLEN 7698 1600 20 FEBRUARY SALESMAN 81 300 30
7521 WARD 7698 1250 22 FEBRUARY SALESMAN 81 500 30
7566 JONES MANAGER 7839 2975 2 APRIL 81 20
7654 MARTIN 7698 28 - SEP - 81 1250 1400 30 SALESMAN
7698 BLAKE MANAGER 7839 2850 MAY 1, 81 30
7782 10 removed MANAGER 7839 2450 June 9 81 10
7839 10 deleted PRESIDENT November 17, 81 5000 10
7844 TURNER 7698 08 - SEP - 81 1500 0 30 SALESMAN
7900 7698 DECEMBER 3, CLERK JAMES 81 950 30
7902 7566 3000 3 DECEMBER ANALYST FORD 81 20
7934 10 deleted CLERK 7782 1300 January 23 82 10

AND

SQL > select' 17-SEP-2010 + 1 double;

ERROR on line 1:
ORA-01722: invalid number

now in the first case, I spent a string and that turned into a date
but in the second case, I try to add a day to this date it is not be converted in the second case.

When in fact the implicit conversion is done.

Thank you and best regards,
Sri ram.

Probably below may be the reason.
In the first query you asked oracle to match the hiring date between two dates. Oracle implicitley equal strings depending on the hiring date data type.
But in the 2nd query you specify a string in your oracle query does not include what format to convert the string.

Tags: Database

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