Match the Chen's notation to the corresponding key and participation constraints.
Question
Match the Chen's notation to the corresponding key and participation constraints.
Solution
In Chen's notation, entities are represented by rectangles, relationships are represented by diamonds, and attributes are represented by ovals.
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Key Constraints: In Chen's notation, key constraints are represented by underlining the attribute that forms the primary key. If an entity has a composite key, then all attributes forming the key are underlined.
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Participation Constraints: These are represented by a double line connecting the entity to the relationship. A single line indicates partial participation, meaning not all entities are involved in the relationship. A double line indicates total participation, meaning all entities are involved in the relationship.
So, to match Chen's notation to the corresponding key and participation constraints, look for underlined attributes for key constraints and check the lines connecting entities and relationships for participation constraints.
Similar Questions
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Consider the following relations to answer Question.Manufacturer (ManufacturerId, MName, DateOfBirth, Gender MAddress, AwardWon)Part (PartNo, PName, Description, ManufacturerId)Order (PartNo, OrderNo, OrderQuantity, OrderedDate, CustomerId)Customer (CustomerId, Email, CName, CAddress, Job, TotalNoOfCustomers)What is/are the most suitable participation constraint (s) to describe has relationship between Order and Part relations?(multiple answers)Select one or more:a.There is partial participation of Order in has relationship.b.There is total participation of Order in has relationship.c.There is total participation of Order with Part.d.There is partial participation of Part in has relationship.e.There is total participation of Part in has relationship.
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