MySQL - sum column value(s) based on row from the same table

Question

I\'m trying to get \'Cash\', \'Check\' and \'Credit Card\' totals in new columns based on ProductID from the same table.

Table - Payments

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Answer 1

I think you're making this a bit more complicated than it needs to be.

SELECT
    ProductID,
    SUM(IF(PaymentMethod = 'Cash', Amount, 0)) AS 'Cash',
    -- snip
    SUM(Amount) AS Total
FROM
    Payments
WHERE
    SaleDate = '2012-02-10'
GROUP BY
    ProductID