How to remove all column values

Hi all

I have a table and I have a column that contains a few value.now null I want to add a constraint not null in this column, but it already contains null values.
How do I delete only the value of this column or how can I do now please help me

One way is to update this column to a default value:

update your-table set your_column='DUMMY' where your_column is NULL;

Tags: Database

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