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Examine the description of the PRODUCT_DETAILS table: Which two statements are true?

2020.2.1 071 130

(检查PRODUCT DETAILS表的描述:哪两个陈述是正确的?)

Examine the description of the PRODUCT_DETAILS table: Which two statements are true? 071-第1张

A PRODUCT_ID can be assigned the PRTMARY REY constraint(可以为PRODUCT_ID分配PRTMARY REY约束:)

B EXPTRY_DATE cannot be used in arithmetic expressions. (EXPTRY_DATE不能在算术表达式中使用。)

C EXPTRY_DATE contains the SYSDATE by default if no date is assigned to it.(如果未分配日期,则默认情况下EXPTRY_DATE包含SYSDATE。)

D PRODUCT_PRICE can be used in an arithmetic expression even if it has no value stored in it. (PRODUCT_PRICE可以在算术表达式中使用,即使其中没​​有存储任何值。)

E PRODUCT_PRICE contains the value zero by default if no value is assigned to it (如果未为其分配值,则PRODUCT_PRICE默认包含零值)

F PRODUCT_NAME cannot contain duplicate values(PRODUCT_NAME不能包含重复值)

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