Error
Error Code:
4154
MySQL Error 4154: NULL in NOT NULL Column
Description
This error indicates an attempt to insert or update a `NULL` value into a column defined with a `NOT NULL` constraint. It typically occurs during data manipulation operations like `INSERT`, `UPDATE`, or `LOAD DATA INFILE` when a required column is left unspecified or explicitly set to `NULL`.
Error Message
NULL supplied to NOT NULL column '%s' at row %ld in file '%s'
Known Causes
3 known causesUnspecified Column Value
An `INSERT` statement omits a column that is defined as `NOT NULL`, or an `UPDATE` statement attempts to set such a column to `NULL`.
Invalid Data in Input File
When using `LOAD DATA INFILE`, the source file contains empty fields or explicit `NULL` values for columns that are defined as `NOT NULL` in the target table.
Default Value Conflicts
A `NOT NULL` column without an explicit `DEFAULT` value is implicitly assigned `NULL` when not specified, leading to a constraint violation.
Solutions
Coming SoonDetailed step-by-step solutions for this error are being prepared. In the meantime, try these general troubleshooting tips:
General Troubleshooting Tips
- Check the error message carefully for specific details
- Review recent changes that might have caused the error
- Search for the exact error code in the official documentation
- Check log files for additional context
- Try restarting the application or service