【Oracle】取整函数trunc与五舍六入函数round

取整语句：

select 
    trunc(12345.678,2),
    trunc(12345.678,1),
    trunc(12345.678,0),
    trunc(12345.678,-1),
    trunc(12345.678,-2)
from dual

执行效果：

SQL> select
  2      trunc(12345.678,2),
  3      trunc(12345.678,1),
  4      trunc(12345.678,0),
  5      trunc(12345.678,-1),
  6      trunc(12345.678,-2)
  7  from dual;

TRUNC(12345.678,2) TRUNC(12345.678,1) TRUNC(12345.678,0) TRUNC(12345.678,-1)
------------------ ------------------ ------------------ -------------------
TRUNC(12345.678,-2)
-------------------
          12345.67            12345.6              12345               12340
              12300

五舍六入函数：

select 
    round(12345.678,2),
    round(12345.678,1),
    round(12345.678,0),
    round(12345.678,-1),
    round(12345.678,-2)
from dual

执行效果：

SQL> select
  2      round(12345.678,2),
  3      round(12345.678,1),
  4      round(12345.678,0),
  5      round(12345.678,-1),
  6      round(12345.678,-2)
  7  from dual;

ROUND(12345.678,2) ROUND(12345.678,1) ROUND(12345.678,0) ROUND(12345.678,-1)
------------------ ------------------ ------------------ -------------------
ROUND(12345.678,-2)
-------------------
          12345.68            12345.7              12346               12350
              12300

END