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Consider the following SQL query:
SELECT COUNT(DISTINCT City) FROM Customers;
What does the query return?
What does the query return?
- a)The total number of customers in each city.
- b)The number of distinct cities in the Customers table.
- c)The number of customers residing in each city.
- d)The number of cities where customers reside.
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Consider the following SQL query:SELECT COUNT(DISTINCT City) FROM Cust...
The number of distinct cities in the Customers table.
Explanation: The SQL query SELECT COUNT(DISTINCT City) FROM Customers; returns the number of distinct cities present in the City column of the Customers table.
Explanation: The SQL query SELECT COUNT(DISTINCT City) FROM Customers; returns the number of distinct cities present in the City column of the Customers table.
Most Upvoted Answer
Consider the following SQL query:SELECT COUNT(DISTINCT City) FROM Cust...
Understanding the SQL Query
The given SQL query is:
sql
SELECT COUNT(DISTINCT City) FROM Customers;
This query is designed to count the unique entries in the `City` column of the `Customers` table. Here's a breakdown of what each part of the query does:
Key Components of the Query
- COUNT() Function: This function calculates the number of rows that match a specified condition. In this case, it's used to count the number of distinct cities.
- DISTINCT Keyword: This keyword ensures that only unique values are considered in the count. Therefore, if multiple customers are from the same city, that city will only be counted once.
- From Clause: The `FROM Customers` specifies that the data is being pulled from the `Customers` table.
What the Query Returns
- The result of the query is a single numeric value representing the total number of distinct cities in which customers reside.
- It does not provide any information about the total number of customers or the distribution of customers across different cities.
Conclusion
Therefore, the correct interpretation of the query is:
- Option b: The number of distinct cities in the Customers table.
This means that if there are, for example, 10 customers from New York, 5 from Los Angeles, and 3 from Chicago, the query would return 3, as there are three distinct cities represented in the data.
The given SQL query is:
sql
SELECT COUNT(DISTINCT City) FROM Customers;
This query is designed to count the unique entries in the `City` column of the `Customers` table. Here's a breakdown of what each part of the query does:
Key Components of the Query
- COUNT() Function: This function calculates the number of rows that match a specified condition. In this case, it's used to count the number of distinct cities.
- DISTINCT Keyword: This keyword ensures that only unique values are considered in the count. Therefore, if multiple customers are from the same city, that city will only be counted once.
- From Clause: The `FROM Customers` specifies that the data is being pulled from the `Customers` table.
What the Query Returns
- The result of the query is a single numeric value representing the total number of distinct cities in which customers reside.
- It does not provide any information about the total number of customers or the distribution of customers across different cities.
Conclusion
Therefore, the correct interpretation of the query is:
- Option b: The number of distinct cities in the Customers table.
This means that if there are, for example, 10 customers from New York, 5 from Los Angeles, and 3 from Chicago, the query would return 3, as there are three distinct cities represented in the data.
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Consider the following SQL query:SELECT COUNT(DISTINCT City) FROM Customers;What does the query return?a)The total number of customers in each city.b)The number of distinct cities in the Customers table.c)The number of customers residing in each city.d)The number of cities where customers reside.Correct answer is option 'B'. Can you explain this answer?
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