OCP-1Z0-051-V9.02-78题

78. Evaluate the following query:

SQL> SELECT TRUNC(ROUND(156.00,-1),-1)   

FROM DUAL;

What would be the outcome?

A. 16

B. 100

C. 160

D. 200

E. 150

Answer: C

  答案解析：

参考： http://blog.youkuaiyun.com/rlhua/article/details/12848395

ROUND(156.00,-1)=160，四舍五入，精确到十位

TRUNC(160，-1)=160，截断精确到十位。

实验验证：

scott@TESTDB> select round(156.00,-1) from dual;

 

ROUND(156.00,-1)

----------------

             160

 

scott@TESTDB> select trunc(160,-1) from dual;

 

TRUNC(160,-1)

-------------

          160