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AdventureWorks Database: Count employees for each city group by using multiple tables

SQL Query - AdventureWorks: Exercise-16 with Solution

16. From the following table write a query in SQL to retrieve the number of employees for each City. Return city and number of employees. Sort the result in ascending order on city.

Sample table: Person.BusinessEntityAddress


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Sample Solution:

SELECT a.City, COUNT(b.AddressID) NoOfEmployees 
FROM Person.BusinessEntityAddress AS b   
    INNER JOIN Person.Address AS a  
        ON b.AddressID = a.AddressID  
GROUP BY a.City  
ORDER BY a.City;

Sample Output:

city                 |noofemployees|
---------------------+-------------+
Abingdon             |            1|
Albany               |            4|
Alexandria           |            2|
Alhambra             |            1|
Alpine               |            1|
Altadena             |            2|
Altamonte Springs    |            1|
Anacortes            |            3|
Arlington            |            1|
Ascheim              |            1|
Atlanta              |            2|
Auburn               |            1|
Augsburg             |            2|
Augusta              |            1|
Aujan Mournede       |            1|
Aurora               |            1|
Austell              |            1|
...

SQL AdventureWorks Editor:

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SQL: Tips of the Day

T-SQL Cast versus Convert?

CONVERT is SQL Server specific, CAST is ANSI.

CONVERT is more flexible in that you can format dates etc. Other than that, they are pretty much the same. If you don't care about the extended features, use CAST.

Ref : https://bit.ly/3VKT5M8