oracle 的四舍五入,Oracle 数值四舍五入

— Start

Oracle 提供了以下四个函数用来做四舍五入。

CEIL 向上四舍五入

FLOOR 向下四舍五入

ROUND 四舍五入

TRUNC 去掉小数

下面让我们通过例子来看看它们之间的不同。

SELECT 5.5 NUM, CEIL(5.5) CEIL, FLOOR(5.5) FLOOR, ROUND(5.5) ROUND, TRUNC(5.5, 0) TRUNC FROM DUAL

UNION ALL

SELECT 2.5 NUM, CEIL(2.5) CEIL, FLOOR(2.5) FLOOR, ROUND(2.5) ROUND, TRUNC(2.5, 0) TRUNC FROM DUAL

UNION ALL

SELECT 1.6 NUM, CEIL(1.6) CEIL, FLOOR(1.6) FLOOR, ROUND(1.6) ROUND, TRUNC(1.6, 0) TRUNC FROM DUAL

UNION ALL

SELECT 1.1 NUM, CEIL(1.1) CEIL, FLOOR(1.1) FLOOR, ROUND(1.1) ROUND, TRUNC(1.1, 0) TRUNC FROM DUAL

UNION ALL

SELECT 1 NUM, CEIL(1) CEIL, FLOOR(1) FLOOR, ROUND(1) ROUND, TRUNC(1, 0) TRUNC FROM DUAL

UNION ALL

SELECT -1 NUM, CEIL(-1) CEIL, FLOOR(-1) FLOOR, ROUND(-1) ROUND, TRUNC(-1, 0) TRUNC FROM DUAL

UNION ALL

SELECT -1.1 NUM, CEIL(-1.1) CEIL, FLOOR(-1.1) FLOOR, ROUND(-1.1) ROUND, TRUNC(-1.1, 0) TRUNC FROM DUAL

UNION ALL

SELECT -1.6 NUM, CEIL(-1.6) CEIL, FLOOR(-1.6) FLOOR, ROUND(-1.6) ROUND, TRUNC(-1.6, 0) TRUNC FROM DUAL

UNION ALL

SELECT -2.5 NUM, CEIL(-2.5) CEIL, FLOOR(-2.5) FLOOR, ROUND(-2.5) ROUND, TRUNC(-2.5, 0) TRUNC FROM DUAL

UNION ALL

SELECT -5.5 NUM, CEIL(-5.5) CEIL, FLOOR(-5.5) FLOOR, ROUND(-5.5) ROUND, TRUNC(-5.5, 0) TRUNC FROM DUAL;

结果如下：

NUM CEIL FLOOR ROUND TRUNC

5.5 6 5 6 5

2.5 3 2 3 2

1.6 2 1 2 1

1.1 2 1 1 1

1 1 1 1 1

-1 -1 -1 -1 -1

-1.1 -1 -2 -1 -1

-1.6 -1 -2 -2 -1

-2.5 -2 -3 -3 -2

-5.5 -5 -6 -6 -5

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— Last edited on 2015-07-27

— Created by ShangBo on 2015-02-23

— End