Explain the primary purpose of a primary key in a database

Assignment Help PL-SQL Programming
Reference no: EM131184334

Discussion

Our society relies on data more and more every day! Where is it stored? How is it accessed? These are general questions that will be answered along your journey through this course. Relational databases:

Please respond to all of the following prompts:

Placing comments in your program at creation is one of many ways to make your program as efficient as possible.

  • Describe a situation in which you have used a database recently.
  • Explain the primary purpose of a primary key in a database.

Lab assignment

Using SQL, get specific rows, using the in condition to specify a particular set of values.

Using the class example database (SQLFUN), create the required SQL statements to produce the following results:

From the L_foods table:

  1. List the description and price values of the following foods:
    • Hamburger
    • French Fries
    • Soda
  2. Sort the rows by the description.

From the L_foods table:

  1. Create a new table containing the following columns from the L_foods table:
    • menu_item
    • description
    • price
  2. Change the name of the description column to food.
  3. Include all the foods that cost less than $5.00.

Reference no: EM131184334

Questions Cloud

What is the most important condition in diagnosing phobia : What is the most important condition in diagnosing phobia? List the different kinds of phobias
How is the world of work changing today : How is the world of work changing today?" Help Carla out by creating an outline of the major points she should discuss with the students.
Identify a diverse group that you will be likely to counsel : Discuss at least two culturally supported counseling interventions from the current literature that you would employ in this case in order to promote optimal wellness and growth of the human spirit, mind, and body.
How are demographics of the united states workforce changing : How are the demographics of the United States workforce changing? How might these changing demographics have an impact on an organization's recruitment strategies and methods?
Explain the primary purpose of a primary key in a database : Describe a situation in which you have used a database recently and Explain the primary purpose of a primary key in a database.
Calculate the capacitance of this device : Application: Spherical capacitor. Two concentric, conducting spheres with radii a = 10 mm and b = 50 mm are separated by a dielectric with relative permittivity εr = 2. Calculate the capacitance of this device.
Summarize the key leadership concepts and techniques : Summarize the key leadership concepts and techniques presented during this course. - Apply these concepts and techniques by describing and evaluating a variety of leaders.
Analyze effects of federal government borrowing on economy : Write an essay analyzing the advantages and disadvantages of deficit spending and the effects of federal government borrowing on the economy i.e., the "crowding out" effect.
Calculate fred net capital gain for the current year : HI6028 Taxation, Theory, Practice & Law ASSIGNMENT. Calculate Fred's net capital gain for the current year. Assume he also has a net capital loss from last year of $10,000 arising from the sale of shares. Would your answer be different if the loss ..

Reviews

Write a Review

PL-SQL Programming Questions & Answers

  Create a database model

Create a database model and Submit the table creation statements for the Database Model.

  Write pl-sql procedures and functions

Write PL/SQL procedures and functions to populate and query that database

  Sql questions

Write a query to display using the employees table the EMPLOYEE_ID, FIRST_NAME, LAST_NAME and HIRE_DATE of every employee who was hired after to 1 January, 1995.

  Run the lab_03_01.sql script

Run the lab_03_01.sql script in the attached file to create the SAL_HISTORY table. Display the structure of the SAL_HISTORY table.

  Write sql queries

Write a query to display the last name, department number, and salary of any employee whose department number and salary both match the department number and salary of any employee who earns a commission.

  Explaining sql insert statement to insert new row in cds

Write down a SQL insert statement to insert new row in "CDS" table.

  Write down name of actors in ascending order

Write down actors (or actress, your choice, but not both) who have won at least two (2) Academy Awards for best actor/actress. Provide the actor name, movie title & year. Order the result by actor name."

  What is an sql injection attack

What is an SQL injection attack? Explain how it works, and what precautions must be taken to prevent SQL injection attacks.What are two advantages of encrypting data stored in the database?

  Determine resonant frequency in series rlc resonant circuit

Given the series RLC resonant circuit in the figure, operating at variable frequency, determine: The resonant frequency ω o ,  The circuit’s quality factor Q , The cut-off frequencies, f 1  & f 2  and the bandwidth BW

  Query that uses cube operator to return lineitemsum

Write summary query which uses CUBE operator to return LineItemSum (which is the sum of InvoiceLineItemAmount) group by Account(an alias for AccountDesciption).

  Query to show customers were missing for existing orders

As DBA, your manager called a meeting and asked why there are so many orders for customers that don't exist in the customer table. Write query which would shows which customers were missing for existing orders. Use a join or a subquery.

  Sql query into a relational algebra statement

Turn this SQL query into a relational algebra statement? SELECT Request.reqfor, Ordering.invamt, Ordering.invnbr, Ordering.invdat

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd