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Hope this guide helps you when you encounter error ora-01722, wrong number ora-06512.

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g.An invalid number error occurs when Oracle tries to convert a string to a variety field but fails. This is often because the specified string value is not a complete number (for example, a letter for a punctuation mark). On exit, you will receive an error message: ORA-01722: Invalid choice.

 

 

g.

Oracle does automatic String2number conversion on stream string values! However, for textual comparisons between SQL, the record must be explicitly separated by a string: the reverse conversion process of number2String is not done automatically, nor at this level of the SQL query.

select max (acc_num) in ACCOUNTS, specifically acc_num between 1001000 and 1001999;

I just included “numeric” values ​​to create linked “strings” by explicitly separating them:

select max (acc_num) during ACCOUNTS, where acc_num is between '1001000' and '1001999';

edit:Indeed, the acc_num column in my kitchen table is defined as String . A invalid number is reported, although not statistically. And some kind of explicit delineation of line numbers solved each of our problems.

On the other hand, Oracle can treat strings as numbers. So that you can apply exacte operations / functions, these queries also work:

Select TABLE from max (string_column);

select string_column in TABLE where string_column is between ‘2’, let alone ‘z’;

select string_column in TABLE where string_column> ‘1’;

select string_column in TABLE, where string_column <= 'b';

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