Oracle SQL语句实现数字四舍五入取整

取整(向下取整):

代码如下:

select floor(5.534) from dual;

select trunc(5.534) from dual;

上面两种用法都可以对数字5.534向下取整,结果为5.

如果要向上取整 ,得到结果为6,则应该用ceil

代码如下:

select ceil(5.534) from dual;

四舍五入:

代码如下:

SELECT round(5.534) FROM dual;

SELECT round(5.534,0) FROM dual;

SELECT round(5.534,1) FROM dual;

SELECT round(5.534,2) FROM dual;

结果分别为 6,  6,  5.5,  5.53

保留N位小数(不四舍五入):

代码如下:

select trunc(5.534,0) from dual;

select trunc(5.534,1) from dual;

select trunc(5.534,2) from dual;

结果分别是 5,5.5,5.53,其中保留0位小数就相当于直接取整了。

数字格式化:

代码如下:

select to_char(12345.123,'99999999.9999') from dual;

结果为12345.123

代码如下:

select to_char(12345.123,'99999999.9900') from dual;

小数后第三第四为不足补0,结果为12345.1230

代码如下:

select to_char(0.123,'99999999.9900') from dual;

select to_char(0.123,'99999990.9900') from dual;

结果分别为 .123, 0.123

相关推荐