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The Uniqueness of Cosmos DB Unique Keys

Hasan Savran explains the scope of unique keys in Cosmos DB:

I wrote about Unique Keys and tried to explain how they work in one of my¬†earlier post. It’s common to use SQL Server’s Primary Key or Unique Indexes to explain Unique Keys of Azure Cosmos DB. If you have a Primary Key in a table in SQL Server, the key you defined cannot be in that table more than once. By adding a unique index or unique constraint in a table, you guarantee that no duplicate values can be in your table. The key word in both of those statement is the¬†TABLE.

Azure CosmosDB Unique Keys do not work like Primary Key or Unique Indexes/Constraints

Read on to learn how Cosmos DB differs.