to_date function with sysdate

4
votes
select TO_CHAR(to_date(sysdate, 'DD-MON-YYYY'), 'DAY') FROM DUAL;

When I run this query the output was : SUNDAY. But we know today is Tuesday(1-1-2013). And

then changed the query as 

select TO_CHAR(to_date('01-JAN-2013', 'DD-MON-YYYY'), 'DAY') FROM DUAL;

answer was :TUESDAY.

then Changed query as 

select TO_CHAR(to_date(sysdate+1, 'DD-MON-YYYY'), 'DAY') FROM DUAL;

answer is :MONDAY.

When I using the sysdate why it is show SUNDAY as output?

I am new in oracle db. Please help me.

3
oracleoracle10goracle11gsysdate
SYSDATE is already a date. Why would you think it was necessary to use TO_DATE() on it? - APC
@APC Now I am studying basics of the oracle, and going through this just tried some examples and this query developed myself from some other query. - ıllıllı lק ıllıllı
when I using SELECT TO_CHAR(TO_DATE(sysdate, 'DD-MM-RRRR'), 'DAY') from dual; The Ans: TUESDAY - ıllıllı lק ıllıllı

3 Answers

6
votes

use this:

 select TO_CHAR(sysdate, 'DAY') FROM DUAL;

you are using this :

 to_date(sysdate, 'DD-MON-YYYY')

which is giving you date=1/1/0013 which is sunday

2
votes

Please refer the documentation for sysdate here. Sysdate is already a date data type.

Your example query is inappropriate as to_date function takes first parameter as String not date.

Try the simple query below:

     select TO_CHAR(sysdate, 'DAY') FROM DUAL;

This should return TUESDAY as output.

2
votes

To_date is used to convert a strin to date. As sysdate is already a date, one must not add add to_date.