A system-generated large integer numeric value unique to each work record. A character alphanumeric classification of the type of component. Clean Technology Investment Programs. Where do you stop? A large alphanumeric field describing the work done on a work record. In the present system, the computer name acts as a primary identifier.
Primary keys cannot be changed in some systems, and it is never good practice. Specify all data types your instructor will specify the target database or allowable set of data types. Your e-mail Input it if you want to receive answer. Logical Data Model in 3rd Normal Form: Ethnic groups in the Middle East.
A date field representing the date a component was purchased. A character alphanumeric field holding the first and last name of the person reporting a service request. Why do we use different scales. Add and milsetone additional entities and attributes as directed by your instructor.
This makes a one-to-one relationship. Because this does not apply to all records, a formal relationship would not have to be established. A component anything from a stick of RAM to an entire turn-key system that is or has been installed in Equipment.
Case Study CTTS – Milestone 04 Data Modeling Solution_图文_百度文库
A character alphanumeric description of the information stored in a software configuration record. The diagram below includes foreign keys, assuming implementation in a relational database. Optional Entities A classification of Equipment.
A component that has been checked into inventory A piece of information concerning software configuration for the Client and possibly for a piece of equipment. All of the cardinalities of the major entities can be determined from the interview or the forms. Each ServiceRequest will be worked on with zero or more WorkRecords initially zero but eventually at least one.
Add this document to collection s. The following diagram illustrates one possible solution. A character alphanumeric field identifying the equipment as PC, Printer, Scanner, etc.
Each EquipmentComponent is a particular ComponentType. You can add this document to your study collection s Sign in Available only to authorized users.
A character alphanumeric classification of the type of component. However, Jeff Summers states that the computer name is sometimes changed. But make sure each non-key attribute exists in only one entity.
solutin Specify all data types your instructor will specify the target database or allowable set of data types. A 3-character alphanumeric field consisting of the initials of the technician performing work.
As a number it would also consume less disk space as a foreign key in related tables and would provide for faster joins.
Case Study CTTS – Milestone 05 Data Model
Specify which attributes are required not nullable. Date field consisting of the date a component was removed from a piece of equipment. The Equipment entity has EquipNum as the primary key. Vendor would be a parent table to PurchaseOrder, contributing the VendorID in a non-identifying relationship. Clean Technology Investment Programs. Date field consisting of the date a component was installed into a piece of equipment.
Where do you stop?
None of the forms hint at a ClientID. Each piece of Equipment is a particular EquipmentType. A large alphanumeric field describing the work done on a work record. A date field consisting of the date a technician did work on a request.
A character alphanumeric barcode ID that is either pre-printed on each component package or added via a label at Coastline Consulting.