Error
Error Code:
3733
MySQL Error 3733: Foreign Key Virtual Column Not Supported
Description
This error occurs when you attempt to define a foreign key constraint where one of the columns involved is a virtual column. MySQL explicitly prohibits using virtual columns in foreign key definitions because their values are not physically stored and can be non-deterministic, making referential integrity enforcement unreliable. It typically arises during `CREATE TABLE` or `ALTER TABLE` operations when defining or modifying foreign key constraints.
Error Message
Foreign key '%s' uses virtual column '%s' which is not supported.
Known Causes
3 known causesAttempt to Define FK on Virtual Column
The `CREATE TABLE` or `ALTER TABLE` statement explicitly tried to establish a foreign key constraint involving a column that is defined as `VIRTUAL`.
Incompatible Schema Design
Your database schema design inherently requires a foreign key to be placed on a virtual column, which conflicts with MySQL's capabilities for referential integrity.
Misunderstanding Virtual Column Limitations
The developer might have overlooked MySQL's restriction that virtual columns, being computed and not physically stored, cannot participate in foreign key relationships.
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