星型架构建模 Azure Synapse
Star Schema modeling Azure Synapse
根据此文档 Primary key, foreign key, and unique key in Synapse SQL pool，Azure Synapse 不支持 foreign keys。
因此，如何在 Azure Synapse 中建模 star schema？还是 Azure Synapse 上没有必要？
根据您链接的文档：
Having primary key and/or unique key allows Synapse SQL pool engine to
generate an optimal execution plan for a query
After creating a table with primary key or unique constraint in
Synapse SQL pool, users need to make sure all values in those columns
are unique. A violation of that may cause the query to return inaccurate result.
从上述内容中得出的结论是 Synapse DB 不支持约束。 PK 和 Unique “约束”纯粹是为了查询性能优化，实际上并不强制执行唯一性。
根据此文档 Primary key, foreign key, and unique key in Synapse SQL pool，Azure Synapse 不支持 foreign keys。
因此，如何在 Azure Synapse 中建模 star schema？还是 Azure Synapse 上没有必要？
根据您链接的文档：
Having primary key and/or unique key allows Synapse SQL pool engine to generate an optimal execution plan for a query
After creating a table with primary key or unique constraint in Synapse SQL pool, users need to make sure all values in those columns are unique. A violation of that may cause the query to return inaccurate result.
从上述内容中得出的结论是 Synapse DB 不支持约束。 PK 和 Unique “约束”纯粹是为了查询性能优化，实际上并不强制执行唯一性。