Ora-06502: pl/sql: How to solve numerical or value errors

ORA-06502: PL/SQL: numeric or value error It is one of the common errors in Oracle database. It usually occurs when PL/SQL code executes an operation and the data type or value does not match, such as trying to convert a string to a number or trying to store a too large number in a variable. Specifically, this error is usually caused by the following reasons:

1. The variable or parameter failed to initialize correctly: in some cases, if the variable or parameter contains an invalid value or string, it will trigger ORA-06502 Error.
2. Data type mismatch: for example, trying to convert a string to a number, or trying to store a number that is too large in a variable.
3. Array out of bounds: When processing an array, if a non-existent index position is accessed, the ORA-06502 Error.

To solve ORA-06502 Errors, you can check and repair them according to the following steps:

1. Check whether variables or parameters in PL/SQL code fail to initialize correctly, and confirm that they meet your business needs. If necessary, you can modify the code to ensure that the variable or parameter has been properly initialized.
2. Check all data type conversions in PL/SQL code and confirm that they are correct. In particular, pay attention to the conversion between strings and numbers, as well as date formatting and parsing.
3. If you use arrays, make sure that the array is not accessed outside its defined range. In particular, pay attention to handling empty arrays or arrays with only one element.
4. Review the application code logic and verify that they meet your business needs. If necessary, modify the code and retest to avoid ORA-06502 Error.

In short, in solving ORA-06502 When an error occurs, you need to carefully check the logic of variables, data types, arrays and application code in PL/SQL code to determine the cause of the error and take appropriate measures to repair it. If the cause of the error cannot be determined, try using the debugging tools provided by Oracle database to diagnose and repair the error.