Question: Problem 1 : Write the appropriate relational algebra that maps to the following functionality: e) Retrieve all users who joined Yelp in 2018 and rated

Problem 1 : Write the appropriate relational algebra that maps to

Problem 1 : Write the appropriate relational algebra that maps to the following functionality:

e) Retrieve all users who joined Yelp in 2018 and rated the Pita Jungle restaurant. f) Find two different relational algebra ways to: Retrieve all restaurants rated by users that joined Yelp in either Year 2016 or 2018. g) Find users who have rated every single business except Chinese restaurants

Users: The Users relation has the following columns (attributes): (1) UserID is a unique identifier for each user (2) name (3) yelping since UserID Name Alice Bob Yelping since 2011-01-01 2011-01-02 Businesses (assume they are restaurants): A business has a unique id, name. A business has one or more categories (stored in a string) BusinessID Name Taco bell Pita jungle Categories Tacos Mexican Mediterranean American Reviews: The Reviews relation consists of the following attributes: (1) UserID: the ID of a user that exists in the users relation. (2) BusinessId: the ID of a business that exists in the Businesses relation (2) Review: a numerical value between 1 and 5 that the user assigned to the business. Note that a user may review a business only once UserID BusinessID Review 1.5 4.0 2

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