Query to display the lowest average cost of books within a subject and the highest average cost of books within a subject. SELECT Min (AVERAGE_COST) AS "Lowest Avg Cost", Max (AVERAGE_COST) AS "Highest Avg Cost" FROM (SELECT BOOK_SUBJECT,Round(Avg (BOOK_COST),2) AS AVERAGE_COST FROM BOOK GROUP BY BOOK_SUBJECT); I got an error ERROR 1248 (42000) at line 1: Every derived table must have its own alias  How can I edit this query to make work?  thanks

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Payback Period

Payback period analysis is a method used to determine the relative time value of a project. It measures the time that a project will take to return its initial investment. The total time taken by the project to return the initial investment made for the project is called the payback period.