In a database system with an "orders" table, write a query to count the number of unique salespeople.Return the number of unique salespeople.
Question
In a database system with an "orders" table, write a query to count the number of unique salespeople.Return the number of unique salespeople.
Solution
Sure, here is a SQL query that will return the number of unique salespeople from the "orders" table:
SELECT COUNT(DISTINCT salesperson) AS unique_salespeople
FROM orders;
Here's a step-by-step breakdown of the query:
-
SELECT: This keyword is used to select data from a database. -
COUNT(DISTINCT salesperson):COUNTis a function that returns the number of rows that matches a specified criterion.DISTINCTis used to remove duplicate values from the result set. So,COUNT(DISTINCT salesperson)will count the number of unique salespeople. -
AS unique_salespeople:ASis used to rename a column or table with an alias. Here, the count of unique salespeople is returned under the alias "unique_salespeople". -
FROM orders: This specifies the table from which to retrieve the data. In this case, it's the "orders" table.
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