Primary Key: A Primary Key in a database table is a field in the table that uniquely identifies every row or record present in the database table. Example: Students in Universities are assigned a unique registration number. Therefore, in a STUDENT database table, the attribute “reg_no” acts as primary key. Entity Integrity: Entity Integrity is a mechanism that is used to protect primary keys in the database. Entity Integrity ensures the following properties for primary key: The primary key of one database table row must not match the primary key of any other row present in the table. No component of primary key must be null.

Question

Want to see the full answer?

Answer 1

Question

100%

Chapter 3, Problem 13P

Program Plan Intro

Primary Key:

A Primary Key in a database table is a field in the table that uniquely identifies every row or record present in the database table.

Example:

Students in Universities are assigned a unique registration number.

Therefore, in a STUDENT database table, the attribute “reg_no” acts as primary key.

Entity Integrity:

Entity Integrity is a mechanism that is used to protect primary keys in the database. Entity Integrity ensures the following properties for primary key:

The primary key of one database table row must not match the primary key of any other row present in the table.

No component of primary key must be null.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Students have asked these similar questions

This battle room is focused on entry level tasks for a network analyst where you will be given trials and reconnaissance, sensor tuning, log aggregation, SIEM queries, and network analysis. For this week’s project, complete the following tasks: From your Project Ares portal, LOG IN Click on LAUNCH GAME. Select the region NORTH AMERICA Click on Battle School Under the BATTLE SCHOOL pop-up window, click on START TRAINING. Under the BATTLE ROOMS tile, click on ENTER. Under the NETWORK ANALYST tile, click on PLAY. Wait for the Battle Room to load. While loading, the BATTLE ROOM button will display red. Once the Battle Room is loaded, the BATTLE ROOM button will turn yellow and the center of the disk display will indicate CONNECTED. Click on the BATTLE ROOM button to enter the Battle Room. Below the TASKS folder, make sure you click on INSTRUCTIONS to download the Network Analyst Fundamentals material. In the Battle Room, under the TASKS menu select task INTRUSION DETECTION. Complete…

Create a relationship between the common field (Technician Number) of the two tables. Make sure that each client must have 1 and only 1 technician assigned, and each technician can have multiple clients. 2. Create a query to show the Client Number, Client Name, Billed, Paid for clients in Anderson city. Save the query. 3. Create a query to show the Technician Number, Last Name, First Name, YTD Earnings for technicians whose Hourly Rate is greater than or equal to 30. Save the query. 4. Create a query to show Client Number, Client Name, Billed, Paid for clients whose technician number is 22 and whose Billed is over 300. Save the query. 5. Create a query to show the Technician Number, Last Name, First Name, Client Number, Client Name for clients whose technician number 23. Save the query. 6. Create a query to show the Technician Number, Last Name, First Name, Client Number, Client Name for clients whose technician number 23 or 29. Save the query Help please Microsoft office access

Dijkstra's Algorithm (part 1). Consider the network shown below, and Dijkstra’s link-state algorithm. Here, we are interested in computing the least cost path from node E (note: the start node here is E) to all other nodes using Dijkstra's algorithm. Using the algorithm statement used in the textbook and its visual representation, complete the "Step 0" row in the table below showing the link state algorithm’s execution by matching the table entries (i), (ii), (iii), and (iv) with their values. Write down your final [correct] answer, as you‘ll need it for the next question.