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SQL: 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


Sample Solution :

SELECT DISTINCT salesman_id
FROM orders;

Output of the Query:

salesman_id
5002
5003
5006
5001
5005
5007

Explanation :

Syntax of select distinct values from a table

Pictorial presentation :

Result of select distinct values from a table

Practice Online


Query Visualization:

Duration:

Query visualization of Select distinct values from a table - Duration

Rows:

Query visualization of Select distinct values from a table - Rows

Cost:

Query visualization of Select distinct values from a table - Cost

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Previous: Write a query to display the columns in a specific order like order date, salesman id, order number and purchase amount from for all the orders.
Next: From the following table, write a SQL query to find the salespeople who lives in the City of 'Paris'. Return salesperson's name, city.

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SQL: Tips of the Day

Can a foreign key be NULL and/or duplicate?

First remember a Foreign key simply requires that the value in that field must exist first in a different table (the parent table). That is all an Foreign key is by definition. Null by definition is not a value. Null means that we do not yet know what the value is.

Ref: https://bit.ly/3uVu3OS