(SELECT SUM(quantity) FROM ordered_items) AS Sum_of_total, (quantity/(SELECT SUM(quantity) FROM ordered_items)*100) AS Percentage_of_all_orders # Given the customer_orders table, Use a subquery to ...

I'm trying to port an application from SQL Server to MySQL (5.6.4) and running into performance issues. MySQL happens to be running on OS X Server, but this seems more like a UNIX question. SELECT ...

Create the tables with referential integrity.Solve following queries using joins and subqueries. 1. Write a query to find the names (first_name, last_name), the salary of the employees who earn more ...