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An Entity of Type : prov:Entity, within Data Space : webisa.webdatacommons.org associated with source dataset(s)

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  • Though your concepts are not clear I tell you primary key is a unique key that can be compared with any table with a secondary key i.e. Foreign Key .First of all find out date in Decresing order i.e.|| SELECT iep.datora,puf.id_farm,puf.cod FROM iep,puf Where iep.datora=puf.datora ORDER BY datora DESC ||This will make the highest date in top. then use TOP property of sql and compare them by taking
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