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Which three statements are true?

Which three statements are true?

A.

The COMMISSION column can contain negative values .

B.

The MANAGER column is a foreign key referencing the EMPNO column.

C.

The SALARY column must have a value .

D.

An index is created automatically in the MANAGER column.

E.

The DEPTNO column in the EMP table can contain the value 1.

F.

The DEPTNO column in the EMP table can contain NULLS .

G.

The DNAME column has a unique constraint.

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