ocp考試題庫:11g-1Z0-051-v9.02-021題
最新學訊:近期OCP認證正在報名中,因考試人員較多請盡快報名獲取最近考試時間,報名費用請聯系在線老師,甲骨文官方認證,報名從速!
我要咨詢ocp考試題庫:11g-1Z0-051-v9.02-021題,完整題庫請點擊這里聯系老師咨詢了解
21. Examine the description of the EMP_DETAILS table given below:
name NULL TYPE
EMP_ID NOT NULL NUMBER
EMP_NAME NOT NULL VARCHAR2 (40)
EMP_IMAGE LONG
Which two statements are true regarding SQL statements that can be executed on the EMP_DETAIL
table? (Choose two.)
A. An EMP_IMAGE column can be included in the GROUP BY clause.
B. An EMP_IMAGE column cannot be included in the ORDER BY clause.
C. You cannot add a new column to the table with LONG as the data type.
D. You can alter the table to include the NOT NULL constraint on the EMP_IMAGE column.
Answer: BC
試題解析:
準則
在使用子查詢創建表時不復制LONG列。
不能在GROUP BY或ORDER BY子句中包括LONG列。
每個表只能使用一個LONG列。
不能對LONG列定義約束條件。
可以要求使用CLOB列,而不是LONG列。