Oracle SQL语句实现数字四舍五入取整

摘要：Oracle SQL语句实现数字四舍五入取整

[b]取整（向下取整）：[/b]

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. [b]如果要向上取整，得到结果为6，则应该用ceil[/b]

select ceil(5.534) from dual;

[b]四舍五入：[/b]

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 [b]保留N位小数（不四舍五入）：[/b]

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。 [b]数字格式化： [/b]

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

结果为12345.123

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

[b]小数后第三第四为不足补0，结果为12345.1230[/b]

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 以上就是编程素材网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。