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Given the view BadSids, it is a simple matter to nd sailors whose sids are not in this view The ideas in this example can be extended to show that QBE is relationally complete
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QBE is a user-friendly query language with a graphical interface The interface depicts each relation in tabular form (Section 61) Queries are posed by placing constants and variables into individual columns and thereby creating an example tuple of the query result Simple conventions are used to express selections, projections, sorting, and duplicate elimination (Section 62) Joins are accomplished in QBE by using the same variable in multiple locations (Section 63) QBE provides a limited form of set di erence through the use of in the relationname column (Section 64) Aggregation (AVG, COUNT, MAX, MIN, and SUM) and grouping (G) can be expressed by adding pre xes (Section 65) The condition box provides a place for more complex query conditions, although queries involving AND or OR can be expressed without using the condition box (Section 66) New, unnamed elds can be created to display information beyond elds retrieved from a relation (Section 67)
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QBE provides support for insertion, deletion and updates of tuples (Section 68) Using a temporary relation, division can be expressed in QBE without using aggregation QBE is relationally complete, taking into account its querying and view creation features (Section 69)
EXERCISES
Exercise 61 Consider the following relational schema An employee can work in more than one department Emp(eid: integer, ename: string, salary: real) Works(eid: integer, did: integer) Dept(did: integer, dname: string, managerid: integer, oornum: integer) Write the following queries in QBE Be sure to underline your variables to distinguish them from your constants 1 Print the names of all employees who work on the 10th oor and make less than $50,000 2 Print the names of all managers who manage three or more departments on the same oor 3 Print the names of all managers who manage 10 or more departments on the same oor 4 Give every employee who works in the toy department a 10 percent raise 5 Print the names of the departments that employee Santa works in 6 Print the names and salaries of employees who work in both the toy department and the candy department 7 Print the names of employees who earn a salary that is either less than $10,000 or more than $100,000 8 Print all of the attributes for employees who work in some department that employee Santa also works in 9 Fire Santa 10 Print the names of employees who make more than $20,000 and work in either the video department or the toy department 11 Print the names of all employees who work on the oor(s) where Jane Dodecahedron works 12 Print the name of each employee who earns more than the manager of the department that he or she works in 13 Print the name of each department that has a manager whose last name is Psmith and who is neither the highest-paid nor the lowest-paid employee in the department Exercise 62 Write the following queries in QBE, based on this schema:
Query-by-Example (QBE)
Suppliers(sid: integer, sname: string, city: string) Parts(pid: integer, pname: string, color: string) Orders(sid: integer, pid: integer, quantity: integer)
1 For each supplier from whom all of the following things have been ordered in quantities of at least 150, print the name and city of the supplier: a blue gear, a red crankshaft, and a yellow bumper 2 Print the names of the purple parts that have been ordered from suppliers located in Madison, Milwaukee, or Waukesha 3 Print the names and cities of suppliers who have an order for more than 150 units of a yellow or purple part 4 Print the pids of parts that have been ordered from a supplier named American but have also been ordered from some supplier with a di erent name in a quantity that is greater than the American order by at least 100 units 5 Print the names of the suppliers located in Madison Could there be any duplicates in the answer 6 Print all available information about suppliers that supply green parts 7 For each order of a red part, print the quantity and the name of the part 8 Print the names of the parts that come in both blue and green (Assume that no two distinct parts can have the same name and color) 9 Print (in ascending order alphabetically) the names of parts supplied both by a Madison supplier and by a Berkeley supplier 10 Print the names of parts supplied by a Madison supplier, but not supplied by any Berkeley supplier Could there be any duplicates in the answer 11 Print the total number of orders 12 Print the largest quantity per order for each sid such that the minimum quantity per order for that supplier is greater than 100 13 Print the average quantity per order of red parts 14 Can you write this query in QBE If so, how Print the sids of suppliers from whom every part has been ordered Exercise 63 Answer the following questions: 1 Describe the various uses for unnamed columns in QBE 2 Describe the various uses for a conditions box in QBE 3 What is unusual about the treatment of duplicates in QBE 4 Is QBE based upon relational algebra, tuple relational calculus, or domain relational calculus Explain brie y 5 Is QBE relationally complete Explain brie y 6 What restrictions does QBE place on update commands
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