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| ALT-Taste f; Sekundärschlüssel m | |||
| Taste mit doppelter Funktion | |||
| Sekundärdaten n | |||
| Alternativschlüssel m (A candidate key that is not designated as the primary key and is used to uniquely identify records in a database table) | |||
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alternate key : 3 短语, 1 学科 |
| 一般 | 3 |