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In my database, I have a table named LOGIN:
Userid password
user1 pwd1
user2 pwd2
So my concern is, when entering Userid, it does not check if white space is there.
For example, I’d like it to show an error when us er 1 is the Userid.
You can make use of LTRIM/RTRIM function and
REPLACE(string,' ',''). This might become very intensive. I would however strongly suggest to have a form of validation and check the integrity of your data before it is entered into the database.