Consider the Supplier-Parts-Catalog schema from the previous question. State what the following queries compute: 1. sname(sid((color =
Question:
1. πsname(πsid((σcolor = 'red' Parts) ⪻⪼ (σcost<100Catalog)) ⪻⪼ Suppliers)
2. πsname(πsid((σcolor = 'red' Parts) ⪻⪼ (σcost<100Catalog) ⪻⪼ Suppliers))
3. (πsname((σcolor = 'red' Parts) ⪻⪼ (σcost<100Catalog) ⪻⪼ Suppliers)) ∩
(πsname((σcolor = 'green' Parts) ⪻⪼ (σcost<100Catalog) ⪻⪼ Suppliers))
4. (πsid((σcolor = 'red' Parts) ⪻⪼ (σcost<100Catalog) ⪻⪼ Suppliers)) ∩
(πsid((σcolor = 'green' Parts) ⪻⪼ (σcost<100Catalog) ⪻⪼ Suppliers))
5. πsname((πsid,sname((σcolor = 'red' Parts) ⪻⪼ (σcost<100Catalog) ⪻⪼ Suppliers)) ∩
(πsid,sname((σcolor = 'green' Parts) ⪻⪼ (σcost<100Catalog) ⪻⪼ Suppliers)))
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The statements can be interpreted as 1 Find the Supplier names of the suppliers ...View the full answer
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Related Book For 
Database management systems
ISBN: 978-0072465631
3rd edition
Authors: Raghu Ramakrishan, Johannes Gehrke, Scott Selikoff
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