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Unity Catalog allows you to define relationships between tables using key columns. Here are the common types of relationships you can set up:
One-to-Many (1:N): In this relationship, one record in the primary table corresponds to multiple records in the related table. For example, a customer can have multiple orders.
Many-to-One (N:1): This is the reverse of the above. Multiple records in the primary table link to a single record in the related table. For instance, multiple orders belong to the same customer.
Many-to-Many (N:N): This type involves an intermediary table that connects two other tables. Itโs useful when multiple records in both tables can be related to each other. For example, students and courses in a university system.
To set up these relations, youโll need to define foreign keys in your tables. These keys link the primary key of one table to the corresponding column in another table.
Unity Catalog doesnโt directly provide an automatic ER diagram generation feature. However, you can create ER diagrams manually using external tools or by visualizing the relationships in your tables.
Manual Approach: Draw your ER diagram manually based on the relationships youโve defined in Unity Catalog. Represent tables as rectangles, primary keys as underlined attributes, and foreign keys as connecting lines.
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