Cursor doesn't work when I type in lowercase or uppercase

Hello world
I have the cursor depending on whether I use to compare a value I entered in my form with the one I have stored in my database. But if I already entered a username like this a JDOE and try to enter again lowercase like this a jdoe, the cursor cannot identify that there is already a username with the same name. How can I fix?

DECLARE
n_dummy NUMBER: = 0;

CURSOR test_User_ID IS
SELECT count (*)
IN MyDatabase
WHERE user_id =: my_database.user_id;
BEGIN
OPEN test_User_ID.
SEEK test_User_ID INTO n_dummy;
CLOSE Test_User_ID;

IF (n_dummy > 0) THEN
MESSAGE ("User id" ' |: my_table.user_id |') "already exists. Please enter an identifier unique to the user. (', acknowledgement of RECEIPT);
RAISE Form_Trigger_Failure;
END IF;
END;

Don't know if I get you exactly, but if you want to check the case, you could do:

SELECT count(*)
FROM my_database
WHERE UPPER(user_id) = UPPER(:my_database.user_id);

Be aware that any index on user_id is not used to this approach.

Tags: Oracle Development

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