If Error 1406 occurs within a MySQL stored procedure or trigger, how does the debugging process differ?

Debugging Error 1406 in stored procedures or triggers requires examining the internal state and context: 1. **Identify the DML Statement:** Pinpoint the exact `INSERT` or `UPDATE` statement within the procedure or trigger that is generating the error. 2. **Inspect Variable Values:** For procedures, examine the values of input parameters and local variables just before the problematic DML statement. For triggers, inspect the `NEW.column_name` values (for `INSERT` and `UPDATE` triggers) or `OLD.column_name` (for `UPDATE` triggers if the old value is used in calculations for the new). 3. **Temporary Logging:** Add temporary `SELECT` statements (in procedures) or write to a dedicated logging table (in triggers) to record the exact data values being processed immediately prior to the failing operation. This helps reveal the oversized data. 4. **Simplified Test Cases:** Create a minimal SQL script to call the procedure or simulate the trigger event with the specific data that caused the error, allowing for isolated debugging.