Write the schema to represent the entities below,including tables,the proper placement of the foreign key,and referential integrity constraint.
Definitions:
Safety Inventory
A stock of goods or materials kept as a buffer to mitigate the risk of stockouts due to uncertainties in supply or demand.
Demand Uncertainty
The degree of unpredictability or variability regarding customer demand for a product or service, often affecting inventory management and supply chain planning.
Performance Level
A measure of an individual, organization, or system's efficiency, effectiveness, and ability to meet its goals.
Excess Capacity
Refers to the situation where a firm or economy can produce more goods or services than currently produced due to available resources not being fully utilized.
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