Question: SELECT title, cost, retail, (( (retail - cost) / retail) * 100) AS Profit Margin FROM books WHERE Profit Margin < 55; !*!*! I am

SELECT title, cost, retail, (( (retail - cost) / retail) * 100) AS "Profit Margin" FROM books WHERE "Profit Margin" < 55;

!*!*! I am getting ORA-00904: "Profit Margin": invalid identifier

Why is that? how to fix it?

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