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?()
A. SELECT student_ id, marks, ROWNUM "Rank" FROM students WHERE ROWNUM <= 10 AND finish_date BETWEEN '01-JAN-99' AND '31-DEC-99' AND course_id = 'INT_SQL' ORDER BY marks DESC;
B. SELECT student_id, marks, ROWID "Rank" FROM students WHERE ROWID <= 10 AND finish_date BETWEEN '01-JAN-99' AND '31-DEC-99' AND course_id = 'INT_SQL' ORDER BY marks;
C. SELECT student_id, marks, ROWNUM "Rank" FROM (SELECT student_id, marks FROM students WHERE ROWNUM <= 10 AND finish_date BETWEEN '01-JAN-99' AND '31-DEC-99' AND course_id = 'INT_SQL' ORDER BY marks DESC);
D. SELECT student_id, marks, ROWNUM "Rank" FROM (SELECT student_id, marks FROM students ORDER BY marks DESC) WHERE ROWNUM <= 10 AND finish_date BETWEEN '01-JAN-99' AND '31-DEC-99' AND course _ id ='INT _ SQL'
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在托收的当事人中,代收行通常是()。
A. 卖方指定的银行
B. 买方指定的银行
C. 出口地银行
D. 进口地银行
飞机在云中绕飞雷雨时应具备的条件是()。
A. 利用航空器自配雷达或者根据气象雷达能够确切判明雷雨位置
B. 大型航空器
C. 距离积雨云和浓积云80公里以上
D. 飞行真实高度在1000米以上
在Windows中,下列哪些操作不能移动窗口()。
A. 将鼠标指向窗口的标题栏,然后按住鼠标左键拖动
B. 将鼠标指向窗口的标题栏,然后按住鼠标右键拖动
C. 将鼠标指向窗口的标题栏,然后单击鼠标
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B. 极限温度
C. 极限浓度
D. 极限体积