Question: I will upvote best answer. Thnx We have a schema for a simple social network We have a collection of users, which is identified by

I will upvote best answer. Thnx We have a schema for

I will upvote best answer. Thnx

We have a schema for a simple social network We have a collection of users, which is identified by unique holders (short names) Friend tells us that holder1 is a friend of holder2 (Friend is uni-directional: holder2 might not be a friend of holder1) And Message says that holder broadcasted a text (message) from city from_city User(holder, name, home_city,bio) Friend(holder1, holder2) Message(holder text,from_city) The relational algebra expression below Explain the following relational algebra below in English that it represents II name, [([II holder O home_city="Kansas City: User] U [II holder home_city="Kansas City" Message ]) User ]

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