Oracle SQL语句实现数字四舍五入取整
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CodeAE代码之家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。
https://www.uoften.com/dbs/oracle/20180415/73432.html
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