The date function does not

Hello
I tried for hours to solve this problem.
I can´t convert a date in year, month or day etc...



Select sysdate, TO_DATE (sysdate, 'YYYY') of the double
ORA-01830: date format picture ends before converting all of the input string
01830 00000 - "date format picture ends before converting all of the input string.




Select sysdate, TO_DATE (sysdate, 'MM') of the double
ORA-01843: not one month valid
01843 00000 - "not one month valid."


Select sysdate, TO_DATE (sysdate, 'DD') of the double
ORA-01830: date format picture ends before converting all of the input string
01830 00000 - "date format picture ends before converting all of the input string.

Please, if this is not the right category to post in just answer me the right one.
Thank you

Hello

user12981132 wrote:
OK, just to clarify. I am not the ADMINISTRATOR, nor have I not privileges for any manipulation of data. I came to a new job where my job is to analyze the data, I have a few sql experience of my old job where I don't have this kind of problems, because they stored a date as a date to lie. But now I have this problem.

I understand that since they stored the date as a varchar I can´t all dates? because if I don't want to count the difference in months or days difference of sysdate for example he wouln´t works ¿right?

You cannot use built-in DATE manipulation functions. or features such as arithmetic, on the channels of the dates.
You can use TO_DATE to convert strings to DATEs in questions where you need to do things like calculate the difference in months. For example:

SELECT     customer_id
,     order_date
,     MONTHS_BETWEEN ( SYSDATE
                 , TO_DATE ( order_date
                             , 'YYYYMMDD'
                     )
                 )  AS months_ago
FROM    orders
;

Obviously, it will be slow, and you will get errors of execution if one of the chains do not represent valid dates.

Tags: Database

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