MySQL 8.4

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CREATE TABLE Fooey(SomeInteger INTEGER PRIMARY KEY);
INSERT INTO Fooey(SomeINteger) VALUES (NULL);

Column 'SomeInteger' cannot be null

INSERT INTO Fooey(SomeINteger) VALUES (NULL);

Column 'SomeInteger' cannot be null

select * from Fooey;

SomeInteger

INSERT INTO Fooey(SomeInteger) VALUES (33);
INSERT INTO Fooey(SomeInteger) VALUES (44);
INSERT INTO Fooey(SomeInteger) VALUES (33);

Duplicate entry '33' for key 'Fooey.PRIMARY'

select * from Fooey;

SomeInteger

33

44

INSERT INTO Fooey(SomeINteger) VALUES (NULL);
INSERT INTO Fooey(SomeINteger) VALUES (NULL);
INSERT INTO Fooey(SomeINteger) VALUES (NULL);
INSERT INTO Fooey(SomeINteger) VALUES (NULL);
INSERT INTO Fooey(SomeINteger) VALUES (NULL);

Column 'SomeInteger' cannot be null

select * from Fooey;

SomeInteger

33

44