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表关系描述了各个表之间的联系,我们可以在模型中编辑已有的表关系。
比如启用/禁用关系、修改关系名称、关系基数、过滤方向等等。
文中会为您介绍如何管理表关系。
在顶部菜单中单击关系管理,可打开模型中所有关系的列表。
选择需要编辑的关系,右侧将出现该关系的属性设置项。
属性 | 说明 |
---|---|
名称 | 关系的名称,默认会以两个模型表的名称和下划线组成。可以修改。 |
基数 | 定义关系规则,有关基数的介绍请见表关系说明。 但请注意与实际数据保持一致,否则可能会导致计算错误。 |
双向交叉过滤 | 手动开启双向的交叉过滤,使模型表之间可以进行双向过滤。 |
禁用关系 | 禁用后关系取消勾选,呈不可用状态。
示意图中关系箭头呈现虚线状态。
模型最终在仪表板中使用时,Customers 表字段拖拽到分类时,Orders 表将置灰不可用,其他的表也因此与 Customers 表失去联系置灰了。
以下是未禁用关系时的表现,当我们将Customers表中的字段拖拽到“分类”时,其他表都是可用的。 |
条件 | 查看关系中相关联的表以及外键字段。
您可以根据需要修改或者添加关联字段。 |