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| 1:1 relationship; one-to-one relationship | |||
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| one-to-one relationship (An association between two tables in which the primary key value of each record in the primary table corresponds to the value in the matching field or fields of one, and only one, record in the related table) | |||
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| one-to-one relation | |||
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en til en relation : 7 短语, 2 学科 |
| 信息技术 | 6 |
| 微软 | 1 |