SQL Exercises: Identify distinct values in a table

SQL Basic Select Statement : Exercise-8 with Solution.

From the following table, write a SQL query to identify the unique salespeople ID. Return salesman_id.

Sample table: orders

ord_no      purch_amt   ord_date    customer_id  salesman_id
----------  ----------  ----------  -----------  -----------
70001       150.5       2012-10-05  3005         5002
70009       270.65      2012-09-10  3001         5005
70002       65.26       2012-10-05  3002         5001
70004       110.5       2012-08-17  3009         5003
70007       948.5       2012-09-10  3005         5002
70005       2400.6      2012-07-27  3007         5001
70008       5760        2012-09-10  3002         5001
70010       1983.43     2012-10-10  3004         5006
70003       2480.4      2012-10-10  3009         5003
70012       250.45      2012-06-27  3008         5002
70011       75.29       2012-08-17  3003         5007
70013       3045.6      2012-04-25  3002         5001

Sample Solution :

-- This query selects unique/distinct values from the 'salesman_id' column in the 'orders' table.
SELECT DISTINCT salesman_id
-- Specifies the table from which to retrieve the data (in this case, 'orders').
FROM orders;

Output of the Query:

salesman_id
5002
5003
5006
5001
5005
5007

Code Explanation :

The said SQL query that selects distinct "salesman_id" columns from the 'orders' table. The "DISTINCT" keyword is used to return unique values, so it will eliminate duplicate rows and only return unique "salesman_id" values from the orders table.

Visual presentation:

Practice Online

Query Visualization:

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