[Retracted] Schema-Based Mapping Approach for Data Transformation to Enrich Semantic Web

Table 3

Query evaluation comparison (on-demand mapping).

Method	Query evaluation time (time in ms)
	Foreign key Equi-join	Natural join	Recursive relation	Multitable and M:N relation
S2SML	931	889	824	1378
Fsparql2sql	893	865	808	1316
RML	874	832	793	1247
RDB-RDF (proposed method)	791	768	714	1168