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<http://webisa.webdatacommons.org/prov/329764181>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/400737543> .
<http://webisa.webdatacommons.org/400737543>	<http://www.w3.org/ns/prov#value>	"Some databases, such as MSSQL and DB2, treat a NULL value as a distinct value, only allowing one per column." .
<http://webisa.webdatacommons.org/prov/296091346>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/400737543> .