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What is the function that converts Oracle to number?

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2022-05-24 16:42:027321browse

oracle中转为数字的函数是“to_number”;该函数可将按一定格式编排过的字符串变回数值型的格式,字符串必须符合数值类型格式,若不符合则会出现错误提示,语法为“to_number(varchar2 or char,'格式')”。

What is the function that converts Oracle to number?

本教程操作环境:Windows10系统、Oracle 11g版、Dell G3电脑。

oracle转为数字的函数是什么

在oracle中,可以使用to_number()函数来将数据转为数字类型,该函数可以将字符串转换为数值型的格式,语法“to_number(varchar2 or char,'格式')”。

to_number()函数是oracle中常用的类型转换函数之一,是将一些处理过的按一定格式编排过的字符串变回数值型的格式。

1、to_number()函数可以将char或varchar2类型的string转换为一个number类型的数值;

2、需要注意的是,被转换的字符串必须符合数值类型格式,如果被转换的字符串不符合数值型格式,Oracle将抛出错误提示;

3、to_number和to_char恰好是两个相反的函数; 

示例如下:

What is the function that converts Oracle to number?

结果为:123.12

(1)to_number(varchar2 or char,'格式')

select to_number('000012134') from dual;  
select to_number('88877') from dual;

(2)如果数字在格式范围内的话,就是正确的,否则就是错误的;如:

select to_number('$12345.678', '$999999.99') from dual;  
select to_number('$12345.678', '$999999.999') from dual;

(3)可以用来实现进制转换;16进制转换为10进制:

select to_number('19f','xxx') from dual;  
select to_number('f','xx') from dual;

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