Adventure Work’s data warehouse includes a Products table that stores data on products, a ProductCategories table that stores product categories. Each product can belong to multiple categories, and each category can have multiple products. Which cardinality type should you set to represent the relationships between these two tables in the model?
Question
Adventure Work’s data warehouse includes a Products table that stores data on products, a ProductCategories table that stores product categories. Each product can belong to multiple categories, and each category can have multiple products. Which cardinality type should you set to represent the relationships between these two tables in the model?
Solution
The relationship between the Products table and the ProductCategories table should be set as a Many-to-Many cardinality type. This is because each product can belong to multiple categories, and each category can have multiple products.
Here are the steps to set this up:
- In your data model, identify the Products table and the ProductCategories table.
- Create a bridge table (also known as a junction table or linking table) to connect these two tables. This table should have two columns: one for ProductID and one for CategoryID. Each row in this table represents a relationship between a product and a category.
- Set up relationships in your data model. Connect the Products table to the bridge table using the ProductID field, and set the cardinality to Many-to-One. Connect the ProductCategories table to the bridge table using the CategoryID field, and set the cardinality to Many-to-One.
- Now, the relationship between the Products table and the ProductCategories table is effectively a Many-to-Many relationship, represented through the bridge table.
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