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SQL Aggregate Function Exercise, Practice and Solution: From the following table, write a SQL query that counts the number of unique salespeople. Return number of salespeople.
SQL Exercise, Practice and Solution: From the following table, write a SQL query to find those rows where col1 does not contain the string ( _/ ). Return col1.
SQL Exercise, Practice and Solution: From the following table, write a SQL query to retrieve the details of the customers whose names begins with the letter 'B'. Return customer_id, cust_name, city, grade, salesman_id.
