SQL Exercise: Salesmen and customer, who belongs to same city

SQL JOINS: Exercise-1 with Solution

From the following tables write a SQL query to find the salesperson and customer who reside in the same city. Return Salesman, cust_name and city.

Sample table: salesman

 salesman_id |    name    |   city   | commission 
-------------+------------+----------+------------
        5001 | James Hoog | New York |       0.15
        5002 | Nail Knite | Paris    |       0.13
        5005 | Pit Alex   | London   |       0.11
        5006 | Mc Lyon    | Paris    |       0.14
        5007 | Paul Adam  | Rome     |       0.13
        5003 | Lauson Hen | San Jose |       0.12

Sample table: customer

 customer_id |   cust_name    |    city    | grade | salesman_id 
-------------+----------------+------------+-------+-------------
        3002 | Nick Rimando   | New York   |   100 |        5001
        3007 | Brad Davis     | New York   |   200 |        5001
        3005 | Graham Zusi    | California |   200 |        5002
        3008 | Julian Green   | London     |   300 |        5002
        3004 | Fabian Johnson | Paris      |   300 |        5006
        3009 | Geoff Cameron  | Berlin     |   100 |        5003
        3003 | Jozy Altidor   | Moscow     |   200 |        5007
        3001 | Brad Guzan     | London     |       |        5005

Sample Solution:

-- This query selects specific columns ('salesman.name' with alias "Salesman", 'customer.cust_name', and 'customer.city') 
-- from the 'salesman' and 'customer' tables.
-- It retrieves data where the 'city' column in the 'salesman' table matches the 'city' column in the 'customer' table.
SELECT salesman.name AS "Salesman", customer.cust_name, customer.city
-- Specifies the tables from which to retrieve the data (in this case, 'salesman' and 'customer').
FROM salesman, customer
-- Specifies the condition for joining the tables and filtering the data.
WHERE salesman.city = customer.city;

Output of the Query:

Salesman	cust_name	city
James Hoog	Nick Rimando	New York
James Hoog	Brad Davis	New York
Pit Alex	Julian Green	London
Mc Lyon		Fabian Johnson	Paris
Nail Knite	Fabian Johnson	Paris
Pit Alex	Brad Guzan	London

Explanation:

The said SQL query is selecting the name of the salesman, the customer's name, and the customer's city from the salesman and customer tables, and only displaying results where the city of the salesman matches the city of the customer. The column "name" of the "salesman" table is given an alias of "Salesman".

Visual Explanation:

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