# Error 1171: All parts of a PRIMARY KEY must be NOT NULL

| Error Code | SQLSTATE | Error                         | Description                                                                                |
| ---------- | -------- | ----------------------------- | ------------------------------------------------------------------------------------------ |
| 1171       | 42000    | ER\_PRIMARY\_CANT\_HAVE\_NULL | All parts of a PRIMARY KEY must be NOT NULL; if you need NULL in a key, use UNIQUE instead |

## Possible Causes and Solutions

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