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1)Use querv tree to optimize the following query. SELECT order_num, mfr, product, rep, price From orders, products Where price >100 And Qty-On-hand >3 and mfr=

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1)Use querv tree to optimize the following query. SELECT order_num, mfr, product, rep, price From orders, products Where price >100 And Qty-On-hand >3 and mfr= mfr_id and product = product_id

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