多项选择题
Which two tasks can you perform using only the TO_CHAR function? （）
A. convert 10 to 'TEN' B. convert '10' to 10 C. convert 10 to '10' D. convert 'TEN' to 10 E. convert a date to a character expression F. convert a character expression to a date
单项选择题 A data manipulation language statement （）.
单项选择题 What does the FORCE option for creating a view do? （）
单项选择题 Which are iSQL*Plus commands? （）
