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Oracle中to_number()函数的学习

Oracle中to_number()函数的学习
 
Oracle中to_number()函数的学习
 
1、
Converts a string to the NUMBER data type(将字符串转换为数字数据类型)
TO_NUMBER(<value>[, <format>, <NLS parameter>]) RETURN NUMBER
select   to_number('00001228')   from   dual; 
to_number('00001228')
                1228 
select   trunc(to_number('123.123'),2)   from   dual;

 

结果为:123.12
2、
Converts a HEX number to FLOAT(转换一个十六进制数的浮标)
TO_NUMBER(<value>, <format>);
SELECT TO_NUMBER('0A', 'XX')
FROM dual;

 

结果为:10
3、
Converts a HEX number to DECIMAL(一个十六进制数转换为十进制)
TO_NUMBER(<binary_float | binary_double | number>,
'<hex mask>') RETURN <binary_float | binary_double | number>;
SELECT TO_NUMBER(100000,'XXXXXXXX')
FROM dual;

 

结果为:1048576
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