DROP TABLE NullExample; /* Delete table if it already exists */ CREATE TABLE NullExample ( a int, b int ); INSERT INTO NullExample VALUES (NULL, NULL); INSERT INTO NullExample VALUES (NULL, 0); INSERT INTO NullExample VALUES (NULL, 10); INSERT INTO NullExample VALUES (NULL, 20); INSERT INTO NullExample VALUES (0, NULL); INSERT INTO NullExample VALUES (0, 0); INSERT INTO NullExample VALUES (0, 10); INSERT INTO NullExample VALUES (0, 20); INSERT INTO NullExample VALUES (10, NULL); INSERT INTO NullExample VALUES (10, 0); INSERT INTO NullExample VALUES (10, 10); INSERT INTO NullExample VALUES (10, 20); INSERT INTO NullExample VALUES (20, NULL); INSERT INTO NullExample VALUES (20, 0); INSERT INTO NullExample VALUES (20, 10); INSERT INTO NullExample VALUES (20, 20);