Error
Error Code:
1230
MySQL Error 1230: Variable Missing Default Value
Description
This error indicates that an operation attempted to assign a value to a column or variable that has been defined without a default value, and no explicit value was provided. It commonly occurs during `INSERT` or `ALTER TABLE` statements involving `NOT NULL` columns.
Error Message
Variable '%s' doesn't have a default value
Known Causes
3 known causesMissing Value in INSERT/UPDATE
An `INSERT` statement attempted to add a new row, or an `UPDATE` statement tried to modify a row, but omitted a value for a `NOT NULL` column that also lacks an explicit `DEFAULT` clause.
Adding NOT NULL Column Without Default
Using `ALTER TABLE ADD COLUMN` to introduce a new `NOT NULL` column to an existing table without specifying a `DEFAULT` value, preventing MySQL from populating existing rows.
Strict SQL Mode Enforcement
When strict SQL modes (e.g., `STRICT_TRANS_TABLES`) are enabled, MySQL enforces stricter rules for `NOT NULL` columns, preventing implicit default value assignments that might occur in non-strict modes.
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