OracleSQL语句如何实现数字四舍五入取整

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取整(向下取整):

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

select ceil(5.534) from dual;

四舍五入:

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):

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:

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

结果为12345.123

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

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

以上就是的小编为大家整理的Oracle中对数字常用的操作,需要的小伙伴可以参考一下。

标签: 四舍五入