How to use to_char method in oracle-Oracle-php.cn

How to use to_char method in oracle

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Release： 2022-06-07 17:56:24

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oracle中“to_char”方法的使用：1、用于日期转换，语法为“to_char(date,'日期格式');”；2、用于处理数字，语法为“to_char(number,'格式');”；3、用于将字段转换为字符串，语法为“to_char(字段)”。

How to use to_char method in oracle

本教程操作环境：windows10系统、Oracle 11g版、Dell G3电脑。

oracle中to char方法怎么用

1）用作日期转换：

to_char(date,&#39;格式&#39;);

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示例如下：

select to_date(&#39;2005-01-01 &#39;,&#39;yyyy-MM-dd&#39;) from dual;
select to_char(sysdate,&#39;yyyy-MM-dd HH24:mi:ss&#39;) from dual;

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（2）处理数字：

to_char(number,&#39;格式&#39;);

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示例如下：

select to_char(88877) from dual;
select to_char(1234567890,&#39;099999999999999&#39;)  from dual;
select to_char(12345678,&#39;999,999,999,999&#39;)  from dual;
select to_char(123456,&#39;99.999&#39;)  from dual;
select to_char(1234567890,&#39;999,999,999,999.9999&#39;)  from dual;

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（3）TO_CHAR 是把xxx转换为字符串，不能指定字符串长度。

TO_CHAR(xxx) 例如：TO_CHAR(999) 得到字符串999

扩展知识：

to_char(salary,'$99,99');

 select TO_CHAR(123,&#39;$99,999.9&#39;) from dual;

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用于进制转换：将10进制转换为16进制；

select to_char(4567,&#39;xxxx&#39;) from dual;
select to_char(123,&#39;xxx&#39;) from dual;

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