Try this : Use LEFT JOIN
SELECT * from propertyfield as pf
LEFT JOIN property as p
ON (pf.pfid = p.propID)
From your question, It says that p.propID has null values. So let the propertyfield be your left tabe, which gives all data from it. and property be your right table, which gives the corresponding values or null if no values.
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solved mysql Left,right join not return null values