单项选择题 Examine the structure of the STUDENTS table: STUDENT_ID NUMBER NOT NULL, Primary Key STUDENT_NAME VARCHAR2(30) COURSE_ID VARCHAR2(10) NOT NULL MARKS NUMBER START_DATE DATE FINISH_DATE DATE You need to create a report of the 10 students who achieved the highest ranking in the course INT SQL and who completed the course in the year 1999. Which SQL statement accomplishes this task?（）

单项选择题 Which SELECT statement should you use to extract the year from the system date and display it in the format "1998"?（）

单项选择题 Which statement correctly describes SQL and /SQL*Plus?（）