Re: refer to SYSDATE function in a CHECK constraint--doable?

HI Roy,

As you have already figured out sysdate cannot be used in a constraint.

John

roy.e.pardee_at_lmco.com wrote:

>Greetings all,
>
>I've got a table with a date field on a 8.1.6.0 db. I'd like to constrain
>the values entered into this field to be less than or equal to the date on
>which the record was entered. I figured a table-level check constraint
>would serve & so I ran:
>
>ALTER TABLE TLB_COPIES
> ADD (CONSTRAINT TLBCPY_DATE_LAST_LABEL_CK CHECK (DATE_LAST_LABEL <=
>SYSDATE)
> EXCEPTIONS INTO COMN_EXCEPTIONS)
>
>And Oracle complained thus:
>
> ADD (CONSTRAINT TLBCPY_DATE_LAST_LABEL_CK CHECK (DATE_LAST_LABEL <=
>SYSDATE)
> *
>ERROR at line 2:
>ORA-02436: date or system variable wrongly specified in CHECK constraint
>
>I've also tried using TO_DATE(SYSDATE) after running accross that expression
>in some code examples in the docs (does SYSDATE not return a date type?),
>but get the same error.
>
>I've searched through metalink for this error, but everything I've found
>deals with how you've got to to_date() a date literal (e.g., no implicit
>conversions) and be sure to use a full four-digit year (as of 8.x I think).
>But I'm not seeing anything that refers to the sysdate function--is it just
>not allowed? I'm pretty sure you can use it as a DEFAULT...
>
>Thanks!
>
>-Roy
>
>Roy Pardee
>Programmer/Analyst
>SWFPAC Lockheed Martin IT
>Extension 8487
>

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