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Maintain a list of materials

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Reference no: EM131088824

Make a separate ERD to show your refinements.  Refine your original ERD to support the following new requirements:

The company wants to maintain a list of materials. The data about materials include a unique material identifier, a name, and an estimated cost. A material can appear on multiple work orders.

Each work order uses a collection of materials. A material used on a work order includes the estimated quantity of the material and the actual quantity of the material used.

The estimated number of hours for a task depends on the work order and task, not on the task alone.  Each task of a work order includes an estimated number of hours.

Reference no: EM131088824

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