What are the three characteristics of an ideal primary key

Assignment Help Basic Computer Science

Reference no: EM131218992

a. Identify the three major tasks for transforming a data model into a database design.

b. What is the relationship between entities and tables? Between attributes and columns?

c. Why is the choice of the primary key important?

d. What are the three characteristics of an ideal primary key?

e. What is a surrogate key? What are its advantages?

Reference no: EM131218992

Questions Cloud

What advantage of not starting family until a woman turns 35 : Research shows that women are waiting until they are older to begin having babies compared to previous years. Marsha and Liam married when she turned 33, and started trying to conceive when she was 35. After a year of trying, they have decided to ..

Design a discrete time matched filter for the cosine signal : Design a discrete-time matched filter for the cosine signal. - Filter the signal plus noise sequence with the matched filter. - At what sample value does the filter output peak.

Declared and assigned some integer values : Assume that a boolean variable named a has been declared and assigned the value true or false. You should also assume that two hint variables named b and c have been declared and assigned some integer values.

Relation schema-relational database schema : Define the following terms: relation schema, relational database schema, domain, attribute, attribute domain, relation instance, relation cardinality, and relation degree.

What are the three characteristics of an ideal primary key : Identify the three major tasks for transforming a data model into a database design.

Application to find the area and perimeter : Using Microsoft® Visual Studio®, write an application to find the area and perimeter of a rectangle for the given input values of Length and Width in different measurement units using inches (in), feet (ft), meters (m), and centimeters (cm).

Find and sketch cross spectral density of the i and q : Find and sketch the PSD of the I and Q components of the narrowband noise process. - Find and sketch the cross-spectral density of the I and Q components.

Describe three ways that a default value can be assigned : Explain why primary keys may never be null, but alternate keys can be null.

What is evidence that adequate training of medical center : What is the evidence that adequate training of medical center personnel couple with Naloxone injection packs will improve outcomes of over-dose incidents in the medical community centers?

User Account

All Pages