If Primary key is set to Auto-increment, there are chances that you would not want to provide its value in insert query.
Here is how to do it in MySQL:
INSERT INTO table_name VALUES (NULL, 'column b', 'col c');
Assumption^: The first column is the primary key set to AI
Similarly you can skip columns for other non-required data:
INSERT INTO table_name(col b,col c) VALUES ('column b', 'col c');