INFO 1103 Homework Project 2

Transcription

1 INFO 1103 Homework Project 2 February 15, 2018 Due March 14, 2018, at the end of the lecture period. 1 Introduction In this project, you will design and create the appropriate tables for a version of the system used in Homework 1. Although your ERD solution for Homework 1 might be as good or better than the one in the diagram below, please use the provided one. insert some data into each table. write SQL queries against this data. Remember, this is to be individual work, unlike the labs. 1

2 Figure 1: Starting ERD 2 Details Details follow about table creation, data insertion and the required queries. 2.1 Table Creation Refer to Figure 1. To keep the amount of work manageable, you only need to handle entities Competition, Dog, Breed, Judge, Prize and the relationships between them. In the given design, Competition is a weak entity, with an identifying owner of Show, itself a weak entity with an identifying owner of Event. Since you cannot have Competition be a weak entity with no identifying owner, make Competition become strong give it CompetitionID as a unique identifier. Dog and Judge are supposed to have more attributes than are shown, but what are shown can be enough for this homework. I found it handy to assume that dogid ranges between 1 and ; you might too. new since draft 2

3 For the derived attributes in Dog for the number of points (top dog and championship), do not have an attribute in your table. (You will later make a view that has these attributes.) You should give a default value of 1 championship point and 2 top-dog points for Prize. Since I have not provided metadata definitions for entities, relationships and attributes, you will have to rely on your own best guesses based on attribute names as to the appropriate types. Use some form of whole numbers for unique identifiers. Ask me questions if you wish. Create a.sql script in the Oracle tool that contains the commands necessary to build the tables. Include all appropriate constraints for domain values, foreign keys and primary keys. Follow the steps for generating tables from ER models (in Chapter 4). 2.2 Data Creation Continue your.sql script to contain the necessary SQL INSERT commands to add several rows to each table. If you wish (and you should wish), you can let place and reported by be null, and the prizes can all win the default number of points. Some of the rows will be of your own choosing, but you need to make sure that the rows added also include the following: 1. at least 4 dogs 2. at least 4 judges. 3. at least 4 competitions and at least 2 dogs per competition. 4. at least one competition where prizes for first place and second place (going to different dogs, of course) were awarded. The first place prize should be worth one more championship and one more top-dog points than the second-place prize. 5. at least two dog breeds, Rottweilers and Golden Retrievers. More breeds are allowed and the grader might add them to see whether anything breaks 6. dogs with ids 25 and 26, but no dog with id a dog who has never competed and who is a loser, in that it has never won a prize. 8. judges with ids 25, 26 and 27 and possibly others. Judges 25 and 26 are qualified for both Golden Retrievers and Rottweilers. Judge 27 is qualified only for Rottweilers. 9. a competition judged by Judge 27 where Golden Retrievers were allowed, although only Rottweilers actually were in the competition. This is the only case where an unqualified judge was illegally at a competition. 3

4 10. no competition where a dog competed even though its breed was not allowed. 11. at least one competition that is for both Rottweilers and Golden Retrievers. 12. at least one competition that is just for Rottweiler and at least one competition that is just for Golden Retrievers. 13. two dogs who are losers and have actually competed. 14. a dog who has competed 5 times and won once. 2.3 Queries Continue your.sql script with some SELECT and CREATE VIEW commands. Some of the queries can be answered from a single table, although many of them require joining tables. Don t take advantage of the fact that you know what is in each of your tables. The grader should be free to add additional rows into your tables, if he wishes. Give SQL statements for the following (maximum points 46 out of 40) points added 1. determine the total number of dogs. (4 pts) since draft 2. determine the total enrolment of dogs in all competitions. (4 pts) 3. find names of all judges who have the same id number as some dog. (4 pts) 4. find the name of one judge qualified for the most breeds. (4 pts) 5. attempt to verify that no dog has won a prize for which it did not compete. Since it is easy to write an incorrect query that returns no results, your tables must have a dog that actually did win a prize that it did not compete for. (4 pts) 6. make a view called DogPoints V that has the attributes for Dog, including the derived attributes that contains the championship points and top-dog points. These derived attributes should be calculated by totalling up the points from prizes. Do a SELECT * from DogPoints V to show your view. (4 pts) 7. show, for each breed name, the maximum top-dog points for any dog of that breed. Use DogPoints V for this. (4 pts) 8. show a report similar to the previous, except that it adds the id for the dog of each breed that has that maximum number of points for the breed. In the event of a tie for some breed, show just one dog of the breed. For partial credit, show all of the dogs that tie for a breed. Make sure that your tables actually do result in a tie for Golden Retrievers. (This query wording change 4

5 and the ones after it are tougher than most of the earlier queries. They don t necessarily just get harder as they go on, though.) (3 pts) 9. find the names of all judges who judged a contest illegally: a dog breed was eligible for that competition, but the judge was not qualified to judge that breed. It should detect the situation even if all the dogs that actually competed in the competition belonged to breeds for which the judge was eligible. (I found EXISTS and MINUS useful for this query.) (3 pts) 10. show dog id, breed, judge name and total championship points received (if > 3) in those competitions where Golden Retrievers were permitted. (3 pts) the > 3 had 11. determine the dog who has the most losing competitions (one in which it competes and doesn t win a prize). If there is a tie, you can either choose one or show all. (3 pts) been determine all dogs that have competed at least as many times as any other dog. Arrange for your data to result in a 2-way tie. (3 pts) 13. find a dog who is the biggest loser (has never won a prize, and, considering all dogs who have never won a prize, has competed in the most competitions). In there is a tie, you can choose to show just one or all. (3 pts) The queries are not necessarily in order of difficulty; if one is stumping you, go on and try the next. However, your script should have the queries in the given order. Please use SQL comments (eg -- query 3) in the script to indicate which query you are giving. 3 Grading Submit your.sql script that creates the tables, populates them, and then answers the queries. It should be possible for whoever grades the assignment to run your script in Oracle SQL Developer and get results, without errors. Submit this on paper and in D2L. The table creations are worth 40%, the insert commands are worth 20%, and the queries (and view creation) are worth 40%. Also, submit (paper and D2L) the transcript of what happens if you play the script (i.e., the contents of the output window in Oracle SQL Developer). 5