How to remove an individual of data in a column

Hi all
I created a table like this script below


CREATE TABLE WORK_ALLOC)
(3) IDENTIFICATION NUMBER,
FORMNAME VARCHAR2 (8).
FORM_TYPE VARCHAR2 (2) NOT NULL);

I insert data in the table above.
Then I add a column called "CNT" Using ALTER TABLE statement.
Can I update the table and enter a value in the first row

UPDATE work_alloc
NTC SET = '100'
WHERE rownum = '1'


Here are the data in my table

CNT ID FORMNAME FO

100 1 txactdef F
2 txalerts F
3 txbehacc EN

Now, I need to delete the value '100' in the column of the CNT.
Y at - it any possibity to remove the value. If Yes please answer.

UPDATE work_alloc
SET CNT = null

Tags: Database

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