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zavuch27 [327]
3 years ago
14

Advantages of e commerce

Computers and Technology
1 answer:
Sloan [31]3 years ago
4 0

Answer:

A Larger Market

Customer Insights Through Tracking And Analytics

Fast Response To Consumer Trends And Market Demand

Lower Cost

More Opportunities To "Sell"

Personalized Messaging

Hope this helps!

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A blood bank maintains two tables - DONOR, with information about people who are willing to donate blood and ACCEPTOR, with info
Kipish [7]

Answer:

The sql query is given below.

Since we need to count of males and females for a particular blood group, we put xxx for the blood group.

SELECT COUNT(SELECT DID FROM DONOR WHERE GENDER LIKE "M%") as Male_Donors,

COUNT(SELECT DID FROM DONOR WHERE GENDER LIKE "F%") as Female_Donors

FROM DONOR

WHERE BG = xxx;

Explanation:

The clauses in the query are as follows.

1. SELECT: all the columns required in the output are put in this clause.

2. FROM JOIN ON: the table(s) from which the above columns are taken are put in this clause.

3. WHERE: any condition required to filter the output is put in this clause.

The query is explained below.

1. Find the number of male donors. Number of anything can be found using COUNT() function. A query is required since gender is included in deciding the type of donor.

2. The query is defined to find number of male donors as follows.

COUNT( SELECT DID FROM DONOR WHERE GENDER LIKE "M%"; )

3. In the previous query, LIKE operator is used since it is not defined what value is stored for male donors.

4. Similarly, the query to find the number of female donors is formed.

COUNT( SELECT DID FROM DONOR WHERE GENDER LIKE "F%"; )

5. Next, the final query is formed as follows.

SELECT: both COUNT() functions will come here.

FROM: table name

WHERE: specific blood group will be put here

GROUP BY: this clause is optional and is not used in this query.

HAVING: this clause is optional and is not used in this query.

6. The query after putting all clauses is shown below.

SELECT COUNT(SELECT DID FROM DONOR WHERE GENDER LIKE "M%"),

COUNT(SELECT DID FROM DONOR WHERE GENDER LIKE "F%")

FROM DONOR

WHERE BG = xxx;

7. Alias is used in the above query for each column to get the final query.

SELECT COUNT(SELECT DID FROM DONOR WHERE GENDER LIKE "M%") as Male_Donors, COUNT(SELECT DID FROM DONOR WHERE GENDER LIKE "F%") as Female_Donors

FROM DONOR

WHERE BG = xxx;

7 0
3 years ago
How many channels can the 2.4 GHz band be divided into?
wlad13 [49]

Answer:Fourteen channels

Explanation:

8 0
2 years ago
Give reasons why local efforts are required to conserve biodiversity​
mario62 [17]
The most obvious reason for conservation is to protect wildlife and promote biodiversity. Protecting wildlife and preserving it for future generations also means that the animals we love don't become a distant memory. And we can maintain a healthy and functional ecosystem.
3 0
2 years ago
How many broadcast domains are created when you segment a network with a 12-port switch?.
Elenna [48]

There is one broadcast domain created when you segment a network with a 12-port switch.  

<h3>What is a Broadcast domain?</h3>

A broadcast domain may be defined as a reasoning classification of a computer network that is significantly based on all nodes and can extend to each other by broadcast at the data link layer.

A network with a 12-port switch significantly creates 12 collision domains and 1 broadcast domain. This broadcast domain is large enough to perform specific functions within a network.

Therefore, there is one large broadcast domain created when you segment a network with a 12-port switch.  

To learn more about Broadcast domains, refer to the link:

brainly.com/question/14482282

#SPJ4

6 0
1 year ago
Write a regular expression of the language havingstrings that either start or end with "00" and have nomore zeroes. Where the al
Brut [27]

Answer:

001*|1*00

Explanation:

The language consists of strings in {0,1} that either start with 00 or end with 00 and have no more zeros.

The requirement can be divided into two parts:

1) Strings that start with 00 and have no more zeros

2) Strings that end with 00 and have no more zeros

Generating regular expressions for these parts:

1) 001*  - starts with two zeros and can have zero or more 1s later

2)1*00  - starts with zero or more 1s and ends with two zeros

So on combining with the or operator(|), the overall regular expression for the strings in the language becomes:

001*|1*00

3 0
3 years ago
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