ORA-01843: not a valid month on a check constraint

Question

I'm trying to put a Check constraint on a born date in a range of date time because I don't want to let the user insert a value < of 01-JAN-1900.

I'm trying to elabourate this as :

CONSTRAINT  BORN_VALIDITY   CHECK(BORN_DATE > TO_DATE('01-GEN-1900','DD-MON-1900'));

I also altered the date format session in the beginning with

ALTER SESSION NSL_DATE_FORMAT = 'DD-MON-YYYY HH24:MI:SS';

but I'm receiving the same error with no pity from Oracle SQL.

There is some other way to set a date range on my check constraint?

Answer 1

Assuming that the language of your DB is Italian, or whatever language in which you can write January as GEN, you should use TO_DATE('01-GEN-1900','DD-MON-YYYY') .

To have a solution that works no matter the language, you could better use the ANSI standard date '1900-01-01'