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These are the details about V$FLASHBACK_DATABASE_STAT： SQL> DESC v$FLASHBACK_DATABASE_STAT Name Null？ Type ------------- -------- -------------- BEGIN_TIME DATE END_TIME DATE FLASHBACK_DATA NUMBER DB_DATA NUMBER REDO_DATA NUMBER ESTIMATED_FLASHBACK_SIZE NUMBER Which two statements regarding the V$FLASHBACK_DATABASE_STATview aretrue？ （）
- A、 BEGIN_TIME is the time at which Flashback logging is enabled.
- B、 END_TIME is the time at which the query is executed on the view.
- C、 REDO_DATA is the number of bytes of redo data written during the interval.
- D、 This view contains information about flashback data pertaining to the last 24 hours.
- E、 FLASHBACK_DATA is the amount of flashback data generated since the database was opened.
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更多 “ These are the details about V$FLASHBACK_DATABASE_STAT： SQL DESC v$FLASHBACK_DATABASE_STAT Name Null？ Type ------------- -------- -------------- BEGIN_TIME DATE END_TIME DATE FLASHBACK_DATA NUMBER DB_DATA NUMBER REDO_DATA NUMBER ESTIMATED_FLASHBACK_SIZE NUMBER Which two statements regarding the V$FLASHBACK_DATABASE_STATview aretrue？ （）A、 BEGIN_TIME is the time at which Flashback logging is enabled.B、 END_TIME is the time at which the query is executed on the view.C、 REDO_DATA is the number of bytes of redo data written during the interval.D、 This view contains information about flashback data pertaining to the last 24 hours.E、 FLASHBACK_DATA is the amount of flashback data generated since the database was opened.” 相关考题
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These are the details about V$FLASHBACK_DATABASE_STAT： SQL DESC V$FLASHBACK_DATABASE_STAT Name Null？ Type ------------- -------- -------------- BEGIN_TIME DATE END_TIME DATE FLASHBACK_DATA NUMBER DB_DATA NUMBER REDO_DATA NUMBER ESTIMATED_FLASHBACK_SIZE NUMBER Which two statements regarding the V$FLASHBACK_DATABASE_STAT view are true？ （）A、BEGIN_TIME is the time at which Flashback logging is enabled.B、END_TIME is the time at which the query is executed on the view.C、REDO_DATA is the number of bytes of redo data written during the interval.D、This view contains information about flashback data pertaining to the last 24 hours.E、FLASHBACK_DATA is the amount of flashback data generated since the database was opened.
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多选题These are the details about V$FLASHBACK_DATABASE_STAT： SQL DESC V$FLASHBACK_DATABASE_STAT Name Null？ Type ------------- -------- -------------- BEGIN_TIME DATE END_TIME DATE FLASHBACK_DATA NUMBER DB_DATA NUMBER REDO_DATA NUMBER ESTIMATED_FLASHBACK_SIZE NUMBER Which two statements regarding the V$FLASHBACK_DATABASE_STAT view are true？ （）ABEGIN_TIME is the time at which Flashback logging is enabled.BEND_TIME is the time at which the query is executed on the view.CREDO_DATA is the number of bytes of redo data written during the interval.DThis view contains information about flashback data pertaining to the last 24 hours.EFLASHBACK_DATA is the amount of flashback data generated since the database was opened.
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单选题Evaluate these two SQL statements: SELECT last_name, salary , hire_date FROM EMPLOYEES ORDER BY salary DESC; SELECT last_name, salary , hire_date FROM EMPLOYEES ORDER BY 2 DESC; What is true about them?（）A
The two statements produce identical results.B
The second statement returns a syntax error.C
There is no need to specify DESC because the results are sorted in descending order by default.D
The two statements can be made to produce identical results by adding a column alias for the salary column in the second SQL statement.
考题
多选题These are the details about V$FLASHBACK_DATABASE_STAT： SQL DESC v$FLASHBACK_DATABASE_STAT Name Null？ Type ------------- -------- -------------- BEGIN_TIME DATE END_TIME DATE FLASHBACK_DATA NUMBER DB_DATA NUMBER REDO_DATA NUMBER ESTIMATED_FLASHBACK_SIZE NUMBER Which two statements regarding the V$FLASHBACK_DATABASE_STATview aretrue？ （）ABEGIN_TIME is the time at which Flashback logging is enabled.BEND_TIME is the time at which the query is executed on the view.CREDO_DATA is the number of bytes of redo data written during the interval.DThis view contains information about flashback data pertaining to the last 24 hours.EFLASHBACK_DATA is the amount of flashback data generated since the database was opened.
考题
单选题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? （）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 mark 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 mark;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 mark DESC;D
SELECT student_id, marks, ROWNUM Rank FROM (SELECT student_id, marks FROM students WHERE (finish_date BETWEEN '01-JAN-99 AND '31-DEC-99' AND course_id = 'INT_SQL' ORDER BY marks DESC) WHERE ROWNUM = 10;E
SELECT student id, marks, ROWNUM Rank FROM (SELECT student_id, marks FROM students ORDER BY marks) WHERE ROWNUM = 10 AND finish date BETWEEN '01-JAN-99' AND '31-DEC-99' AND course _ id 'INT_SQL';
考题
单选题以下的PL/SQL声明哪个是正确的？（）A
v_id NUMBER(4);B
v_x, v_y, v_z VARCHAR2(10);C
v_birthdate DATE NOT NULL;D
v_in_stock BOOLEAN := 1;
考题
单选题Evaluate these two SQL statements: SELECT last_name, salary, hire_dateFROM EMPLOYEES ORDRE BY salary DESC; SELECT last_name, salary, hire_dateFROM EMPOLYEES ORDER BY 2 DESC; What is true about them? （）A
The two statements produce identical results.B
The second statement returns a syntax error.C
There is no need to specify DESC because the results are sorted in descending order by default.D
The two statements can be made to produce identical results by adding a column alias for the salary column in the second SQL statement.
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