Structure of the CUSTOMERS Table

question 32

Multiple Choice

Structure of the CUSTOMERS table

-Which of the following queries will display the first and last name of the individual who referred another customer, along with the customer# of the referred customer?

• A) SELECT r.firstname, r.lastname, c.customer# FROM customers r, customers c WHERE r.customer# = c.referred;
• B) SELECT r.firstname, r.lastname, c.customer# FROM customers r JOIN customers c ON r.customer# = c.referred;
• C) SELECT r.firstname, r.lastname, c.customer# FROM customers r NATURAL JOIN customers c;
• D) both a and b

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Definitions:

Critical Value

A point on the scale of the test statistic beyond which we reject the null hypothesis, depending on the level of significance.

Independent Variables

Variables in an experiment or model that are manipulated or categorized to observe their effects on dependent variables.

Observations

The act of recording or noting a fact or occurrence for some scientific or analytical purpose.

Adjusted Coefficient

A modified version of a coefficient in statistical models that accounts for certain factors or variables to improve the model's accuracy or interpretability.