Oracle - 数字处理 - 取上取整、向下取整、保留N位小数、四舍五入、数字格式化
1 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 2 3 取整(向下取整): 4 select floor(5.534) from dual; 5 select trunc(5.534) from dual; 6 上面两种用法都可以对数字5.534向下取整,结果为5. 7 8 如果要向上取整 ,得到结果为6,则应该用ceil 9 select ceil(5.534) from dual; 10 11 12 四舍五入: 13 SELECT round(5.534) FROM dual; 14 SELECT round(5.534,0) FROM dual; 15 SELECT round(5.534,1) FROM dual; 16 SELECT round(5.534,2) FROM dual; 17 结果分别为 6, 6, 5.5, 5.53 18 19 20 保留N位小数(不四舍五入)按位数截取: 21 select trunc(5.534,0) from dual; 22 select trunc(5.534,1) from dual; 23 select trunc(5.534,2) from dual; 24 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。 25 26 27 数字格式化: 28 select to_char(12345.123,'99999999.9999') from dual; 29 结果为12345.123 30 31 select to_char(12345.123,'99999999.9900') from dual; 32 小数后第三第四为不足补0,结果为12345.1230 33 34 select to_char(0.123,'99999999.9900') from dual; 35 select to_char(0.123,'99999990.9900') from dual; 36 结果分别为 .123, 0.123
作者:Jeremy.Wu
出处:https://www.cnblogs.com/jeremywucnblog/
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