Use the database tables below to answer the following questions. 
-Which field in the PURCHASE ORDERS table is a foreign key?
Definitions:
Rain
Precipitation in the form of liquid water droplets that have condensed from atmospheric vapor and then become heavy enough to fall under gravity.
False Positives
Incorrect identifications where a test result improperly indicates presence of a condition (like a disease) when it is not actually present.
Test Positive
To show the presence of a particular condition or substance in a test, indicating that the condition or substance was detected.
British Columbia
A province located on the west coast of Canada, known for its natural scenery and diverse landscapes.
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