# Error 1089: Incorrect prefix key; the used key part isn't a string, the used length is longer than t

| Error Code | SQLSTATE | Error               | Description                                                                                                                                                   |
| ---------- | -------- | ------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| 1089       | HY000    | ER\_WRONG\_SUB\_KEY | Incorrect prefix key; the used key part isn't a string, the used length is longer than the key part, or the storage engine doesn't support unique prefix keys |

## Possible Causes and Solutions

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