All categories

3 years ago

Define a query that uses the Natural Join command to join three tables to produce useful information.

Computers and Technology

1 answer:

vichka [17]3 years ago

6 0

Answer:

SELECT column_1, column_2, ... column_n

FROM table_name_1

JOIN table_name_2 ON table_name_1.primaryColumn = table_name_2.foreignKeyColumn

AND table_name_3 ON table_name_1.primaryColumn = table_name_3.foreignKeyColumn

Explanation:

The SQL or structured query language statement returns information from the three tables in the database with the 'select' and 'join' clause in the statement. There are several types of join but the default is the inner join. Other types of join are; outer, left and right join.

You might be interested in

These things are commonly found on the front of desktop computer cases:

jok3333 [9.3K]

USB ports, headphone jack/microphone port, and of course, a power button.

3 0

3 years ago

Explain how using assistive technology can promote healthy emotional and social development. Discuss how you think young childre

mina [271]

Assistive technology is commonly used by people with multiple disabilities. It helps them to live more comfortable and it makes their life much easier.

7 0

4 years ago

After a webcast is completed there are no files left on your computer.

astra-53 [7]

What are you askinggggggggggg

7 0

3 years ago

5 potential Challenges of Collaborative Tools

Mice21 [21]

You have most probably used some variation of collaboration tools like Slack, Basecamp, and Trello at some office gig. Working within a few of these tools might sometimes have a lot of problems.

1. Forced collaboration on Employees.

Some companies may sometimes fail to notice that some employees do not want to constantly have real-time notifications popping up every minute. They may fail to recognize what is important and what is not and end up wasting money on these tools.

2. The roll-out

These tools might represent awesome business productivity growth but sadly, a huge portion of the employees will be like, what is this? If management decides to use collaboration tools, they should explain what they are and the purpose of using them.

3. Lack of User Training.

Organizations that do not offer strong training programs for these tools can see problems arise very quickly. This could help gain insight on whether or not employees want to collaborate in the first place.

4. The “reduction in email” argument

People might positively accept these tools and become a bit connected. However, the downside to it is that, whenever something big is due, everyone falls back to email. Users need to seriously use these tools across a variety of contexts.

5. The overloading of documents and files.

If collaboration tools are rolled out for the sake of process documents and burdensome tracking sheets, people might head right back to their email and full meeting schedules and collaboration will die in the flood.

5 0

3 years ago

If a database is not maintained or if incorrect data is entered into the database, serious problems can occur. What problems cou

Archy [21]

Database is maintained by keeping only relevant data and updating existing data in a timely manner.

This is achieved by issuing proper insert, update and delete operations.

Incorrect data leads to incomplete information. Databases which hold transaction details, any inaccuracies lead to misinformation to its users.

Both the above lead to serious issues in data maintenance and prove the database ineffective. This indicates manhandling of the database.

No maintenance

Database is maintained when only relevant information is present. Irrelevant information includes information like information of past students, old information of current students, etc.

For students who have completed their courses and left, the database should be updated by removing data of such students.

Also, for newly enrolled students, their enrolment should reflect in the official records.

In case of changes in any of the student information, timely update operations should be performed to keep only current data in the database.

All these operations should be done timely in order to avoid any discrepancies in the real data and updated data in the system.

Incorrect data

In situations where incorrect data is input in the student database, incorrect data will be recorded for that particular student. Incorrect data can be related to ssn, name, address, course details and fees payment.

In case of incorrect transaction details like fees payment, this incorrect data will reflect in the student record as well as will affect the overall earnings of the school.

For enrolled students, correct enrollment details regarding the course and classroom should be recorded. Any error in this data will cause the student inconvenience and the respective student will be at loss.

Also, taking advantage of this situation, any outsider acting as an enrolled student, can gain access to the school.

This leads to mismatch of information and can lead to fraud situations against the educational institute.

3 0

3 years ago