Oracle四舍五入,向上取整,向下取整
用oracle sql对数字进行操作: 取上取整、向下取整、保留N位小数、四舍五入、数字格式化 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)按位数截取: 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
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