CREATE TABLE BooleanNullExample ( a int, b int ); INSERT INTO BooleanNullExample VALUES (NULL, NULL); INSERT INTO BooleanNullExample VALUES (NULL, 1); INSERT INTO BooleanNullExample VALUES (NULL, 0); INSERT INTO BooleanNullExample VALUES (0, NULL); INSERT INTO BooleanNullExample VALUES (0, 1); INSERT INTO BooleanNullExample VALUES (0, 0); INSERT INTO BooleanNullExample VALUES (1, NULL); INSERT INTO BooleanNullExample VALUES (1, 1); INSERT INTO BooleanNullExample VALUES (1, 0);