大家好，我是考100分的小小码 ，祝大家学习进步，加薪顺利呀。今天说一说【2019年8月】OCP 071认证考试最新版本的考试原题-第30题「建议收藏」,希望您对编程的造诣更进一步.
choose two
Evalute these conmands which execate sucestully
CREATE SEQUENCE ord_seq
INCREMENT BY 1
START WITH 1
MAXVALUE 100000
CYCLE
CACHE 5000;
Which two statements are true atout the ORD_ITEMS table and the ORD_SEQ sequence?
A) Any user inserting rows into table ORD_ITEMS must have been granted access to sequence ORD_SEQ.
B) Colunn ORD_NO gets the next number from squence ORD_SEQ whenever a row is inserted into ORD_ITEMS and no explict value is given for ORD_NO.
C) Sepuence ORD_SEQ cycles back to 1 after every 5000 numbers and can cycle 20 times
D) IF sequence ORD_SEQ is dropped then the default value for column ORD_NO will be NULL for rows inserted into ORD_ITEMS.
E) Sequence ORD_SEQ is guaranteed not to genenate duplicate numbers.
Answer：AB
(解析：序列是可以共享的，但是需要给予 select 的权限;可以从序列中获取下一个值。)
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