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Ò». RelationShip(ÁªÏµ)

Ïȸø³öPDÊÖ²áÀï¶ÔÁªÏµµÄ¶¨Ò壺¡°A relationship is a link between entities. For example, in a CDM that manages human resources, the relationship Member links the entities Employee and Team, because employees can be members of teams. This relationship expresses that each employee works in a team and that each team has employees.¡± ¿É¼û£¬Ò²ÐíÁªÏµµÄ¸ÅÄîÕæµÄÌ«¼òµ¥Á˰ɣ¬ËùÒÔ·´¶ø²»ÄÇôºÃ±íÊö£¬ËùÒÔPDµÄÎĵµÀïÒ²ÊÇÓÃÒ»¸öÀý×ÓÀ´ËµÃ÷³öÏÖÁËʲôÑùµÄÇé¿öÎÒÃǾÍÈÏΪÁ½¸öʵÌå¼äÊÇÓÐÁªÏµµÄ¡£

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1.mandatory

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2.dependent

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3.dominant

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