[单选]
The STUDENT_GRADES table has these columns:
STUDENT_ID NUMBER(12)
SEMESTER_END DATE
GPA NUMBER(4,3)
The register has requested a report listing the students' grade point averages (GPA), sorted from highest grade point average to lowest within each semester, starting from the earliest date. Which statement accomplishes this?（）

A . SELECT student_id, semester_end, gpa FROM student_grades ORDER BY semester_end DESC, gpa DESC;
B . SELECT student_id, semester_end, gpa FROM student_grades ORDER BY semester _end, ASC,gpa ASC;
C . SELECT student_id, semester_end, gpa FROM student_grades ORDER BY semester _end, gpa DESC;
D . SELECT student_id, semester_end, gpa FROM student_grades ORDER BY gpa DESC,semester_end DESC;
E . SELECT student_id, semester_end, gpa FROM student_grade

A media failure has occurred. This has resulted in all the members of the next hop log group being rendered inaccessible to the log writer process （LGWR） at a log switch. How does this failure affect the operational database？（） The database re-created the missing redo log files automatically.。 The database continues to function normally with the existing files.。 The database allows only queries， no other statements are allowed.。 The database returns and error and the database instance shuts down.。 The user sessions that generate redo logs are terminated automatically.。破乳剂的代号是（） DOAT-A1221。 RP-6075。 COREXIF2774。 You created a department report and preview it in life preview. The font for the department name is too small and you want to enlarge it but do not want to change the font for any other fields. What is the easiest way to make this change?（） Select the text to be enlarged in the life previewer and make the size change using the style bar. 。 Select the text to be enlarged in the layout mode and make the change. 。 Open the report wizard in the re-entrant mode and make the change. 。 Make the copy of the report, open the copy, make the changes and then delete the original report.&e。 You performed an incremental level 0 backup of a database: RMAN > BACKUP INCREMENTAL LEVEL 0 DATABASE; To enable block change tracking after the incremental level 0 backup, you issued this command: SQL > ALTER DATABASE ENABLE BLOCK CHANGE TRACKING USING FILE ‘ /mydir/rman_change_track.f’; To perform an incremental level 1 cumulative backup, you issued this command: RMAN> BACKUP INCREMENTAL LEVEL 1 CUMULATIVE DATABASE; Which three statements are true?（） Backup change tracking will sometimes reduce I/O performed during cumulative incremental backups.。 The change tracking file must always be backed up when you perform a full database backup.。 Block change tracking will always reduce I/O performed during cumulative incremental backups.。 More than one database block may be read by an incremental backup for a change made to a single block.。 The incremental level 1 backup that immediately follows the enabling of block change tracking will not read the change tracking file to discover changed blocks.。 YSP118型钢瓶，允许最大充装重量为（）kg。 118；。 120；。 49.5；。 50。

The STUDENT_GRADES table has these columns:
STUDENT_ID NUMBER(12)
SEMESTER_END DATE
GPA NUMBER(4,3)
The register has requested a report listing the students' grade point averages (GPA), sorted from highest grade point average to lowest within each semester, starting from the earliest date. Which statement accomplishes this?（）

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