63、(22-4) choose the best answer:

View the Exhibit and examine the data in the PRODUCTS table.

Which statement would add a column called PRICE, which cannot contain NULL?

A) ALTER TABLE products

ADD price NUMBER(8,2) DEFAULT NOT NULL;

B) ALTER TABLE products

ADD price NUMBER(8,2) DEFAULT CONSTRAINT p_nn NOT NULL;

C) ALTER TABLE products

ADD price NUMBER(8,2) NOT NULL;

D) ALTER TABLE products

ADD price NUMBER(8,2) DEFAULT 0 NOT NULL;

Answer：D

(解析，因为表可能已经有数据，如果新加的列为非空约束，则必须要有一个默认值，否则已经存在的行该列上的值为空，会违反非空约束)

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