MySQL Error 3106: Unsupported Operation on Generated Column

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Description

Error 3106 indicates that an attempt was made to perform an operation not supported on a generated column. Generated columns derive their values from other columns in the same row and are subject to specific restrictions on how they can be manipulated or defined. This error typically occurs when trying to directly update, insert a value into, or alter a generated column in an invalid way.

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Error Message

'%s' is not supported for generated columns.

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Known Causes

3 known causes

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Direct Update of a Generated Column

Generated columns are read-only; attempting to directly modify their values using an UPDATE statement will trigger this error.

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Inserting Values into a Generated Column

MySQL automatically computes the values for generated columns; direct insertion attempts via INSERT statements are not permitted.

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Invalid ALTER TABLE Operation

Certain ALTER TABLE operations, such as adding a default value or incorrectly changing the generation expression, are not supported for existing generated columns.

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Solutions

Coming Soon

Detailed 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

Find Help

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Related Errors

5 related errors