Oracle 判断是否为数字型(金额型)
在oracle中没有这样的方法,要实现判断是否为数字型需要自己写一个方法来实现。但也可以用其它方法:
在sql server,校验数据是否为数字型比较容易,有提供的方法可以使用:
ISNUMERIC
当是数字型,方法返回值为1;否则返回值为0
例:
select * from tablename where isnumeric(data) = 1
在Oracle中没有这样的方法,要实现判断是否为数字型需要自己写一个方法来实现。但也可以用其它方法:
方法一,用正则的方法:
使用 regexp_like
例:
select * from tablename where
regexp_like(trim(data),'^([\-]?[0-9]+\.[0-9]+)$|^([\-]?[0-9])+$|^([\-]?[0-9]{1}\.[0-9]+E[\-]?[0-9])+$')
这个正则分三部分:
1、^([\-]?[0-9]+\.[0-9]+)$
浮点型,包括带小数点的情况
2、^([\-]?[0-9])+$
整数型
3、^([\-]?[0-9]{1}\.[0-9]+E[\-]?[0-9])+$
科学计数法表示的数字
以上三部分均包括了负数的情况
注:regexp_like适用于oracle 10g及其之后的版本,之前的不适用。
方法二,用正则的方法:
使用translate方法
例:
select data,decode(trim(translate(trim(cdata),'0123456789.',' ')),'','is number','not number')
from tablename
但上面这个还不太完善,没有考虑负数,科学计数法表示,数据本身为空,,或对“.”的验证。
所以使用方法二的时候要注意,或修改之(写得比较完善有点麻烦,不如写个方法了)。

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