The image cncpt052.gif shows Table EMP, which has eight columns:

• EMPNO
• ENAME
• JOB
• MGR
• HIREDATE
• SAL
• COMM
• DEPTNO

The ENAME column has a NOT NULL Constraint--no row may contain a null value for this column. Column COMM has an absence of a NOT NULL Constraint--any row can contain null for this column.

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