Computers And Technology College

Use subqueries: find the full names of all employees who are of the same gender of
their supervisor or have the same birthday as her fellow employees.
Is the query correlated or non-correlated?
What is the internal memory required?
What is the number of operations/comparisons?

Answers

Answer 1

The SQL sub queries are useful in achieving complex queries by dividing them into manageable parts. There are two types of sub queries: a correlation sub query and a non-correlated sub query. In sub query, find the full names of all employees who are of the same gender as employee_id 122.

The full names of all employees who are of the same gender as employee _id 122 are obtained using the sub query and the following query:SELECT first_name, last_name FROM employees WHERE gender = (SELECT gender FROM employees WHERE employee_id = 122)The sub query executes first, which returns a gender value based on the employee_id column that matches the employee_id of 122 in this scenario. The main query then uses this result to return the first and last names of all employees that match the gender value. Thus, in the above-mentioned sub query, the number of operations performed is two. That is, one SELECT statement inside another. A sub query is utilized to return data that will be used in the main query, and it can be included in different SQL statements, including INSERT, UPDATE, and DELETE. Furthermore, sub queries can be used with various comparison operators such as IN, NOT IN, ANY, and ALL to return various results depending on the application.

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Related Questions

Which of the following statements about changing requirements in software development, are correct?

Answers

The following statement about changing requirements in software development, is correct: Organizations must adapt to rapidly changing market conditions to stay relevant in business. (Option D)

What is software development?

Software development refers to the process of designing, creating, testing, and maintaining software applications, frameworks, or other software components used by computers or other devices.

The statement "Changes are acceptable till design but once development starts, any further change should be rejected" is incorrect as changes in software requirements can occur at any stage of the software development life cycle.

However, changes made later in the development cycle can be more expensive and time-consuming to implement, and they can introduce additional risks to the project.

The statement "In traditional way of software development, once the requirements are baseline, further changes can be easily accepted with light process" is also not entirely true. Any changes to baselined requirements should be subject to a formal change control process.

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Full Question:

Although part of your question is missing, you might be referring to this full question:


Which of the following statements about changing requirements in software development, are correct?

In traditional way of software development, once the requirements are base lined, further changes should undergo heavy change control process

Changes are acceptable till design but once development starts, any further change should be rejected

In traditional way of software development, once the requirements are base lined, further changes can be easily accepted with light process.

Organizations must adapt to rapidly changing market conditions to stay relevant in business​

the following circuit connects the output of a comparator (u1a) to an led (d1). which of the following condition is correct? g

Answers

The following circuit connects the output of a comparator (U1A) to an LED (D1). The condition is correct.

To determine if the condition is correct, we must examine the circuit and the functionality of the components. U1A is a comparator, meaning it takes two inputs and compares them. If the input voltage of U1A is higher than the reference voltage, U1A's output will be high (1). D1 is an LED, meaning when it is activated it will produce light. In this circuit, D1 is connected to U1A's output. Therefore, if U1A's output is high, the LED will be activated, and if U1A's output is low, the LED will not be activated.

To determine if the condition is correct, we must consider the logic of the circuit. If U1A's input voltage is higher than the reference voltage, U1A's output will be high and the LED will be activated. Therefore, the given condition is correct.

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FILL IN THE BLANK. In the Reno TCP when TCP enters the fast recovery if a new (non-duplicate) ACK arrives, TCP _____.

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In the Reno TCP, when TCP enters the fast recovery if a new (non-duplicate) ACK arrives, TCP increments the congestion window by 1 segment instead of 1/2 segment.

The Reno TCP was the first modification of TCP that addressed congestion. It replaces the slow start and congestion avoidance algorithms with a more aggressive algorithm that speeds up the recovery process when packet loss is detected in the network. The Reno TCP is able to detect the loss of a packet by the receipt of three duplicate acknowledgments, as it believes that the sender has transmitted a packet that has been lost. The Reno TCP then changes to fast recovery mode when it detects the third duplicate acknowledgement.

The Reno TCP is an enhancement to the TCP congestion avoidance algorithm that improves its ability to handle congestion in the Internet. It is a variant of TCP that is designed to cope with network congestion by quickly responding to lost packets, rather than relying on the slow, steady approach of TCP's congestion avoidance algorithm. The Reno TCP is able to detect the loss of a packet by the receipt of three duplicate acknowledgments, as it believes that the sender has transmitted a packet that has been lost.

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fill in the blank. ___ are text-based systems. Users must key in commands to tell the computer what to do. The primary method of inputs is the keyboard. A mouse is not needed.

Answers

Computers are text-based systems. Users must key in commands to tell the computer what to do. The primary method of input is the keyboard; a mouse is not needed.

In order to interact with the computer, a user must input commands into the system in order to give the computer instructions. The commands are usually in the form of words, numbers, and symbols. After the user enters the command, the computer will process the command and respond accordingly. The user can then type in more commands and the computer will repeat the process until the user is finished. This method of input allows users to be very precise in their instructions, as each individual command is processed and executed by the computer.

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The structures used to store data

Answers

Answer:

you can store data in list , Tuple , map and array

Explanation:

list means in the form:

list = [1,2,3,4,5]

Tuple = (1,2,3,4,5)

map = {1:2, 2:3 , 3:4}

array = [

[1,2,3,4,5]

[6,7,8,9,10]

]

difference

list is used to access the stored data by usinf the index. Tuple consider each elements as a string

map used to store connected data's like age and name of some one and acces it using either of them and areay used to store 2 dimensional data

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