By Raghu Ramakrishnan,Johannes Gehrke,Jeff Derstadt, Scott Selikoff, and Lin Zhu
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Salaries) FROM Employees E 11. This cannot be expressed in relational algebra or relational calculus or SQL. The problem is that there is no restriction on the number of intermediate ﬂights. All of the query methods could ﬁnd if there was a ﬂight directly from Madison to Timbuktu and if there was a sequence of two ﬂights that started in Madison and ended in Timbuktu. , data-independent) upper bound on the number of intermediate ﬂights. ) In this query, however, the upper bound is not static but dynamic (based upon the set of tuples in the Flights relation).
10. For every supplier that only supplies green parts, print the name of the supplier and the total number of parts that she supplies. 11. For every supplier that supplies a green part and a red part, print the name and price of the most expensive part that she supplies. 2 Answer omitted. 3 The following relations keep track of airline ﬂight information: Flights(ﬂno: integer, from: string, to: string, distance: integer, departs: time, arrives: time, price: real) Aircraft(aid: integer, aname: string, cruisingrange: integer) Certiﬁed(eid: integer, aid: integer) Employees(eid: integer, ename: string, salary: integer) Note that the Employees relation describes pilots and other kinds of employees as well; every pilot is certiﬁed for some aircraft, and only pilots are certiﬁed to ﬂy.
Pid)) 6. pid))) 7. color = ‘red’ OR AND (NOT EXISTS (SELECT FROM WHERE 8. pid)))) 9. cost Relational Algebra and Calculus 10. sid ) 11. 4 Consider the Supplier-Parts-Catalog schema from the previous question. State what the following queries compute: 1. πsname (πsid ((σcolor= red P arts) (σcost<100 Catalog)) Suppliers) 2. πsname (πsid ((σcolor= red P arts) (σcost<100 Catalog) Suppliers)) 3. (πsname ((σcolor= red P arts) (σcost<100 Catalog) (πsname ((σcolor= green P arts) 4. (πsid ((σcolor= red P arts) (σcost<100 Catalog) (σcost<100 Catalog) (πsid ((σcolor= green P arts) Suppliers)) ∩ Suppliers)) Suppliers)) ∩ (σcost<100 Catalog) Suppliers)) 5.