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Exercise 1:
Write a CHECK constraint that expresses the following condition on attribute Rating in table Movies in Movie Database: "Any possible value of Rating is either a null value or a number in the interval from 0 to 10 inclusively".
Exercise 2:
Write a CHECK constraint that expresses the following condition on records in table Laptop in Hardware Database: "If the screen is larger than 20, then the price is higher than 2000".
Exercise 3:
Write a CHECK constraint that expresses the following condition on table Schedule in University Database: "Each course (occurring in this table) is offered at least two times". Hint: Use NOT EXISTS.
Exercise 4:
Write a CHECK constraint that expresses the following condition on table StarsIn in Movie Database: "Each movie (occurring in this table) has at most one director". Hint: Use NOT EXISTS.
Find an example of an actual data warehouse. For this example, explain the content, user access methods, purpose, and sources of data (what on-line transaction processing [OLTP] databases feed data into the data warehouse) -
Find the entities from the functional requirements. Entities can come from Nouns in the text, they may also come from forms, reports and legacy code.
What is the order P of the B+-tree if B+-tree access structure on the key is constructed? What is the number of leaf-level blocks needed if blocks are approximately 69% full (round up for convenience)?
Draw an ERD containing the order and customer entity types connected by a 1-M relationship from customer to order. Choose an appropriate relationship name using your common knowledge of interactions between customers and orders.
Complete the 8- to 10-slide Microsoft® PowerPoint® presentation in which you explain the principles of database design and management. Include the following
Create a Database and modify your script to reference your Database. Download the tutorial Creating a Database in MySQL Omnymbus Environment from the folder in Doc-Sharing titled Omnymbus Tutorial Files. Follow the steps to create a database in MyS..
Estimate a Bernoulli Naive Bayes classifer and apply the classifier to the test document - You are asked to perform group average hierarchical clustering on this dataset.
One of the major topics deals with the data collection for requirements gathering for a new proposed system. Welcome to week 3. Five characteristics that will come in handy during the requirements determination stage are impertinence, impartialit..
Relational Algebra- The database used for this question is a very simple one with the following schema: (Primary keys are bold, foreign keys are underlined)
Why is a Key important in a database? How does it help with Referential Integrity? Lists three compelling reasons why Keys are crucial to table structure
Design a minimal relational database for Pieces Boutique. By minimal, it is meant that option to post a key into existing table because of either needed participation or a discernible high load could be exercised where appropriate.
What is online analytical processing? How is OLAP related to databases? What is a pivot table, and how are pivot tables and OLAP related?
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