CREATE TABLE Documents
(
doc_id INTEGER NOT NULL,
doc_name VARCHAR(100) NOT NULL,
doc_cost DECIMAL(10, 2)
);
| Every table column is either a NULL column or a NOT NULL column, and that state is specified in the table definition at creation time. A column that does not allow NULL values does not accept rows with no value - in other words, that column will always be required when rows are inserted or updated. |