Ora 01722 invalid number updating date

SQLException: ORA-01722: invalid number" I don�t understand why. Thanks Claudia Vaztaken from here ORA-01722 invalid number Cause: The attempted conversion of a character string to a number failed because the character string was not a valid numeric literal.Only numeric fields or character fields containing numeric data may be used in arithmetic functions or expressions.codigo is a number and '99999%' can not be properly converted to a number for comparison.What you want to do is convert codigo to character data so you can do the comparison.Only numeric fields may be added to or subtracted from dates.

As soon as this implicit TO_NUMBER processes an alphanumeric Value, the query errs out. In more complex joins it’s not uncommon that the optimizer decides to apply the predicates in an order that might be performing better.

Practically speaking, there are several common and simple ways in which you could produce this error.

If you attempt to add or subtract dates to or from string values, the result will produce ORA-01722 (such as in an expression ’06-JUL-15′ ‘xyz’).

Valid numbers will contain the digits zero through nine, and can contain specific characters such as /- at the beginning or end of the string, a single decimal point or an ‘E’ (upper or lower case) for floating point numbers in scientific notation.

You should double check the character strings in the expression in question to make sure that the numbers follow these precise rules.

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The problem is I'm working on a system that's already been designed and would like to speed up the validation of the data within a particular table, which holds both numbers and characters in a certain column.

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