单项选择题
Evaluate the SQL statement:SELECT ROUND(TRUNC(MOD(1600,10),-1),2)FROM dual;What will be displayed?（）
A.0 B.1 C.0.00 D.an error statement
单项选择题 Which SQL statement displays the date March 19, 2001 in a format that appears as "Nineteenth of March 2001 12:00:00 AM"?（）
单项选择题 In which scenario would an index be most useful?（）
单项选择题 A subquery can be used to（）.
