oracle单行函数之数字函数

round--四舍五入函数

trunc--截断函数

mod--求余函数

round和trunc除了可以操作数字外还可以操作日期。

Demo

SQL> select round(45.926,2),round(45.926,1),round(45.926,0),round(45.926),round(45.926,-1),round(45.926,-2)
  2  from dual
  3  ;
 
ROUND(45.926,2) ROUND(45.926,1) ROUND(45.926,0) ROUND(45.926) ROUND(45.926,-1) ROUND(45.926,-2)
--------------- --------------- --------------- ------------- ---------------- ----------------
          45.93            45.9              46            46               50                0
 

SQL> select trunc(45.926,2),trunc(45.926,1),trunc(45.926,0),trunc(45.926),trunc(45.926,-1),trunc(45.926,-2)
  2  from dual;
 
TRUNC(45.926,2) TRUNC(45.926,1) TRUNC(45.926,0) TRUNC(45.926) TRUNC(45.926,-1) TRUNC(45.926,-2)
--------------- --------------- --------------- ------------- ---------------- ----------------
          45.92            45.9              45            45               40                0
 
SQL> select mod(15,4) from dual;
 
 MOD(15,4)
----------
         3