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How to use to_char method in oracle

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2022-06-07 17:56:2423095browse

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,'格式');

示例如下:

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

(2)处理数字:

to_char(number,'格式');

示例如下:

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

(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,'$99,999.9') from dual;

用于进制转换:将10进制转换为16进制;

select to_char(4567,'xxxx') from dual;
select to_char(123,'xxx') from dual;

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