Here is a sample CREATE TABLE statement.

      CREATE TABLE          PAYROLL_TBL
            (EMPL_ID        CHAR(4)      NOT NULL,
             STOR_ID        CHAR(4)      NOT NULL,
             DUE_DATE       DATE         NOT NULL,
             HRSTHIS_PAYPRD DECIMAL(4,1) NOT NULL DEFAULT,
             GROSS          DECIMAL(8,2) NOT NULL DEFAULT,
             TAX            DECIMAL(8,2) NOT NULL DEFAULT,
             CONSTRAINT     PAYROLL_PK   PRIMARY KEY (EMPL_ID, STOR_ID, DUE_DATE),
             CONSTRAINT     PYRL_EMPL_FK FOREIGN KEY (EMPL_ID)
                                         REFERENCES EMPLOYEE_TBL(EMPL_ID),
             CONSTRAINT     PYRL_STOR_FK FOREIGN KEY (STOR_ID)
                                         REFERENCES STORE_TBL(STOR_ID));

As you can see, it contains a table name with many columns.

Each column has a column name, a data type, and several column constraints.
The column constraints include NOT NULL and DEFAULT.

Several named table constraints are followed by one PRIMARY KEY and two FOREIGN KEYs.