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Table 3 A list of metadata extracted from RDB

From: A novel approach for learning ontology from relational database: from the construction to the evaluation

RDB Tables Columns PKs FKs Instances
North 30 150 30 25 5029
Iscommerce 5 20 5 6 200
Ecommerce 25 100 25 17 5000
EcommerceDB 3 20 4 2 1000
Sakila 16 90 18 22 47,237
Northwind 13 89 16 13 2110
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