How can a not null constraint be dropped?
- by Tomislav Nakic-Alfirevic
Let's say there's a table created as follows:
create table testTable ( colA int not null )
How would you drop the not null constraint? I'm looking for something along the lines of
ALTER TABLE testTable ALTER COLUMN colA DROP NOT NULL;
which is what it would look like if I used PostgreSQL. To my amazement, as far as I've been able to find, the MySQL docs, Google and yes, even Stackoverflow (in spite of dozens or hundreds of NULL-related questions) don't seem to lead towards a single simple SQL statement which will do the job.
