Flashback Drop
Flashback Query
Flashback Transaction Query
Flashback Versions Query
Flashback Table
第1题：
Evaluate this SQL statement: SELECT e.EMPLOYEE_ID,e.LAST_NAME,e.DEPARTMENT_ID, d.DEPARTMENT_NAME FROM EMP e, DEPARTMENT d WHERE e.DEPARTMENT_ID = d.DEPARTMENT_ID; In the statement, which capabilities of a SELECT statement are performed?（）
A. Selection, projection, join
B. Difference, projection, join
C. Selection, intersection, join
D. Intersection, projection, join
E. Difference, projection, product
第2题：
A place is moved from day into night and from night into day over and over by ______ of the earth.
A.the pushing B.the pulling C.the spinning D.the passing
第3题：
A. the most of
B. most of
C. most
第4题：
Date line passed eastbound, ______.
A.jumping over today
B.backing to yesterday
C.jumping over tomorrow
D.backing to the day before yesterday
第5题：
The direction a vessel is pointed at any given time is the ______.
A.course
B.track
C.heading
D.course over the ground
第6题：
Evaluate this SQL statement:SELECT e.EMPLOYEE_ID,e.LAST_NAME,e.DEPARTMENT_ID, d.DEPARTMENT_NAMEFROM EMPLOYEES e, DEPARTMENTS dWHERE e.DEPARTMENT_ID = d.DEPARTMENT_ID;In the statement, which capabilities of a SELECT statement are performed?（）
A.selection, projection, join
B.difference, projection, join
C.selection, intersection, join
D.intersection, projection, join
E.difference, projection, product
第7题：
A journal kept by the officer of the watch in which day to day happenings are recorded regarding the deck department is the ______.
A.cargo record book
B.deck rough log
C.bell book
D.Official Logbook
第8题：
on an average day，an overwhelming majority of britons over the age of 1 5 read a national or local paper. ()
第9题：
The direction in which a vessel is steered is the course. The path actually followed is the ______.
A.route
B.track
C.heading
D.course over the ground
第10题：
What two descriptions best define DWDM？ （）