In the standard (x,y) coordinate plane, the midpoint of AB is (4,–3) and A is located at (1,–5). If (x,y) are thecoordinates of B, what is the value of x+y?
A.
19
B.
8
C.
6
D.
-1.5
E.
-3
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参考答案:
举一反三
【单选题】查找出SCOTT所在部门的所有职工( )
A.
select count(*) from emp where deptno= (select deptno from emp where ename='SCOTT');
B.
select sum(*) from emp where deptno= (select deptno from emp where ename='SCOTT');
C.
select * from emp where empno= (select empno from emp where ename='SCOTT');
D.
select * from emp where deptno= (select deptno from emp where ename='SCOTT');
【单选题】What will be the result of using the SQL> DROP USER SCOTT CASCADE; command?()
A.
The user, Scott, is dropped, all the objects in Scott’s schema are placed in the Recycle Bin, and the objects that are already in the Recycle Bin are dropped.
B.
The user, Scott, is dropped, all the objects in Scott’s schema are placed in the Recycle Bin, and all the objects in the Recycle Bin, belonging to the user Scott, are not dropped.
C.
The user, Scott, is dropped, all the objects in the Scott’s schema are not placed in the Recycle Bin, and the objects in the Recycle Bin, belonging to the user, Scott, are not dropped.
D.
The user, Scott, is dropped, all the objects in Scott’s schema are not placed in the Recycle Bin, and the objects in the Recycle Bin are dropped.
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