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One side effect of normalization is that you often need more than one table to get meaningful results. For example, you may have a table that includes a list of parts and the ID number for the vendor of each part. To find the name or phone number of the vendor, you would have to consult a table that contains vendor information. In many situations, either a join or a nested query will provide the information you need. Sometimes only one approach works, or one approach is better than the other one.
With these thoughts in mind, address the following:
What are the advantages and disadvantages of joins and nested queries?
Identify specific situations in which each technique would be preferred over the other.
Explain your reasoning.
Which field or fields cause a table to no longer be in third normal form? In which normal form is denormalized table?
Given the following business scenario, create a Crow's Foot ERD using a specialization hierarchy if appropriate. Tiny Hospital keeps information on patients and hospital rooms
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You are creating a database of measured meteorological data for use in weather and climate research. Explain a structure type measured_data_t with components site_id_num.
Draw an E-R Diagram and draw an E-R Diagram for Student Information System.
determine the functional dependencies that exist in the following table. After determining the functional dependencies, convert this table to an equivalent collection of tables.
Express given five loosely described problems carefully in { Instance, Question } form as utilized in "Computers and Intractability". Determine that a list of n numbers has no duplicates.
Artificially small example of B+ tree is shown here (pdf). (Note only part of tree is shown in detail.) What nodes of example B+ tree are visited to find posting list for "dune"?
Perform the conceptual database design using Entity-Relationship model. You must submit the Entity-Relationship diagram of your database and develop queries in the target DBMS
Create an ER diagram using the set of requirements provided for Oxford City Council's bicycle sharing scheme and identify the minimal set of functional dependencies and all candidate keys for the relation R
Describe the database and describe the four characteristics of the database? Explain the Relational Database and generate a relational database for five employees.
When a student has not chosen a major at a university, the university often enters a value of "Undecided" for the major field. Is "Undecided" a way to represent the null value? Should it be used as a default value? Justify your answer carefully.
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