ORA-01722: 无效号码错误

Question

I am running the below mentioned query in my Oracle client and i am getting

ORA-01722: invalid number

error. I know the issue is due to the TAG_VALUE column being of type " varchar2 " and i am converting it to number and then using that field in where clause. I have tried using " CAST " function but that is also not helping. If i run the query neglecting the last where condition with code WHERE (P.TAG_VALUE > '100') then i am getting the result but including the last where clause gives me error.

 SELECT DISTINCT
      count(P.CREATED_DATETIME)
    FROM
      ( 
      select OUTPUT_TAG_ID,TO_NUMBER(TAG_VAL,'9999.99') AS 
    TAG_VALUE,TAG_VAL_TS,CREATED_DATETIME
    from OV80STG.PRCSD_DATA_OUTPUT_ARCHIVE
    where MODEL_CODE='MDLADV1538'
    AND TAG_VAL <> 'U_Transfer_rate'
      )   P
    WHERE
    (P.TAG_VALUE > '100')

Any suggestion will be appreciated. Thanks.

Answer 1

Remove the single quotes from around the value in the where , you don't need them when its an integer. query will be like this:

SELECT DISTINCT
    COUNT(P.CREATED_DATETIME)
FROM
(
    SELECT
        OUTPUT_TAG_ID,
        TO_NUMBER(TAG_VAL, '9999.99') AS TAG_VALUE,
        TAG_VAL_TS,
        CREATED_DATETIME
    FROM OV80STG.PRCSD_DATA_OUTPUT_ARCHIVE
    WHERE MODEL_CODE = 'MDLADV1538'
          AND TAG_VAL <> 'U_Transfer_rate'
) P
WHERE(P.TAG_VALUE > 100);

Answer 2

TO_NUMBER函数返回一个数值，因此，如注释中所述，您不应将其与字符串值进行比较。

Answer 3

我通过在子查询中包含外部where子句解决了这个问题，然后我得到了所需的结果，没有任何错误。