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RETRIEVAL: MULTIPLE TABLES AND AGGREGATION
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select , , from where DEPTNO -------10 20 30 40 SQL>
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x.deptno x.dname 0 as headcount departments x x.deptno not in (select y.deptno from employees y); DNAME HEADCOUNT ---------- --------ACCOUNTING 3 TRAINING 5 SALES 6 HR 0
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8.11 Exercises
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The following exercises will help you to better understand the topics covered in this chapter. The answers are presented in Appendix D. 1. 2. 3. 4. Produce an overview of all course offerings. Provide the course code, begin date, course duration, and name of the trainer. Provide an overview, in two columns, showing the names of all employees who ever attended an SQL course, with the name of the trainer. For all employees, list their name, initials, and yearly salary (including bonus and commission). For all course offerings, list the course code, begin date, and number of registrations. Sort your results on the number of registrations, from high to low. List the course code, begin date, and number of registrations for all course offerings in 1999 with at least three registrations. Provide the employee numbers of all employees who ever taught a course as a trainer, but never attended a course as an attendee. Which employees attended a specific course more than once For all trainers, provide their name and initials, the number of courses they taught, the total number of students they had in their classes, and the average evaluation rating. Round the evaluation ratings to one decimal. List the name and initials of all trainers who ever had their own manager as a student in a general course (category GEN).
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5. 6. 7. 8.
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10. Did we ever use two classrooms at the same time in the same course location
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RETRIEVAL: MULTIPLE TABLES AND AGGREGATION
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11. Produce a matrix report (one column per department, one row for each job) where each cell shows the number of employees for a specific department and a specific job. In a single SQL statement, it is impossible to dynamically derive the number of columns needed, so you may assume you have three departments only: 10, 20, and 30. 12. Listing 8-26 produces information about all departments with more than four employees. How can you change the query to show information about all departments with fewer than four employees 13. Look at Listings 8-44 and 8-45. Are those two queries logically equivalent Investigate the two queries and explain the differences, if any.
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Retrieval: Some Advanced Features
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This is the fourth chapter in a series about retrieval features of SQL. It is a logical continuation of s 4, 5, and 8. First, we revisit subqueries, beginning with an introduction to the three operators ANY, ALL, and EXISTS. These operators allow you to create a special relationship between main queries and subqueries, as opposed to using the IN operator or standard comparison operators. You will also learn about correlated subqueries, which are subqueries where some subquery clauses refer to column expressions from the main query. In Sections 9.2 and 9.3, we will look at subqueries in query components other than the WHERE clause: the SELECT and the FROM clauses. In Section 9.4 we will discuss the WITH clause, also referred to as subquery factoring, which allows you to define one or more subqueries in the beginning of your SQL commands, and then to reference them by name in the remainder of your SQL command. We continue with hierarchical queries. Relational tables are essentially flat structures, but they can represent hierarchical data structures; for example, by using foreign key constraints referring to the primary key of the same table. The MGR column of the EMPLOYEES table is a classic example of such a hierarchical relationship. Oracle SQL supports explicit syntax to simplify retrieval of hierarchical data structures. The next subject we investigate is analytical functions. Within the context of a single row (or tuple variable), you can reference data in other rows and use it for comparisons and calculations. Finally, this chapter discusses a helpful Oracle SQL feature allowing you to travel back in time: flashback queries.
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