Question: Discuss the semi - join strategy for executing an equijoin of two relations BOOK and PUBLISHER located at different sites S 1 , S 2

Discuss the semi-join strategy for executing an equijoin of two relations BOOK and PUBLISHER located at different sites S1, S2 respectively. How is it advantageous over simple join processing?
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Discuss the semi-join strategy for executing an equijoin of two relations

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