I have stockcards and stockcategories table.
I want to display categories and show how many stockcards is openned under this category.
SELECT a.stockCatID, a.stockCatName, f.nProductsInside
FROM stockcategories a
LEFT JOIN
(
SELECT COUNT(b.stockID) AS nProductsInside
FROM stockcards b
)
f ON a.stockCatID = f.stockCatID
Well it returns #1054 - Unknown column 'f.stockCatID' in 'on clause'
Obviously I am making a mistake..