66、(22-19)choose two
Examine the structure proposed for the TRANSACTIONS table:
Which two statements are true regarding the creation and storage of data in the above table structure?
A) The TRANS_DATE column would be able to store day, month, century, year, hour, minutes, seconds,
and fractions of seconds.
B) The CUST_STATUS column would store exactly one character.
C) The TRANS_VALIDITY column would have a maximum size of one character.
D) The TRANS_VALIDITY column would give an error.
E) The CUST_STATUS column would give an error.
F) The CUST_CREDIT LIMIT column would not be able to store decimal values.
Answer：BD
(解析：定义列的数据类型时，char 的可以省略位数，默认是 1，但是 varchar2 不能省略位数，否则报错。
注意 date 和 timestamp 的格式区别：
date 类型存储数据的格式为年月日时分秒，可以精确到秒
timestamp 类型存储数据的格式为年月日时分秒，可以精确到纳秒(9 位)
)