how do i get the sum of the 4th column

Posted by every_answer_gets_a_point on Stack Overflow See other posts from Stack Overflow or by every_answer_gets_a_point
Published on 2010-03-16T21:40:12Z Indexed on 2010/03/16 21:51 UTC
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this statement will generate a 4 column table:

SELECT shipped.badguy AS badguy, shipped.sdate AS LineDate,
        'Delivery' AS Legend, -price*quantity AS amount
    FROM product JOIN shipped ON (product.id = shipped.product)
UNION
  SELECT receipt.badguy, receipt.rdate,notes, amount
  FROM 

how do i get the total sum of the 4th of column of what the above generates?

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