I set default value in a field NOT NULL. The sql is as follows.

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Asked: June 16, 20262026-06-16T12:42:48+00:00 2026-06-16T12:42:48+00:00

I set default value in a field NOT NULL.
The sql is as follows.

insert into table_name () values ()

I expected this sql should be rejected by MySQL as a field restricts NULL.
But, the field had a value “”(null character string).

Then, I tried another sql.

insert into table_name (name) values (NULL)

As this sql was rejected, no value was inserted.

MySQL seems to distinguish NULL and “”. Do I have to avoid first sql such as “values ()”?

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Editorial Team · Answer 1 · 2026-06-16T12:42:49+00:00

Editorial Team

Do I have to set default value in a field that is set as NOT NULL?

YES if you are doing an INSERT where in you will not set any values to the NOT NULL columns

and

NO not needed anymore, if you are providing a value on the columns that are NOT NULL on INSERT.

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