How can I define that the value of a column should always be in UPPER case

Hi,
I want to make sure that the value in a column is always in UPPER case.
Can we give this condition while creating or altering a table.
A trigger can do it easily, but I was wondering if we could define a column to have values with upper case all the time, independent of what values are inserted. I mean if we give a lower case value in the insert statement, it should be converted automatically to upper case & stored.
I want something like
Alter table MY_TABLE Modify ( col1_upper varchar2(25) default UPPER(Col1_upper));
But the above statement does not work as it references the col of the table.
Thanks
Sunil

Well, you can put a check constraint on to prevent someone from putting lowercase data in:
alter table my_table add constraint my_table_check_upper check (col1_upper = upper(col1_upper));However, I know of no way to modify the data being inserted/updated in a table without a trigger.
Richard

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Hi,
Have you debug these two applications? Does it go into the catch exception block when you close the client or the server?
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How can I define that the value of a column should always be in UPPER case

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