Why do it all in the SQL statment? Why not
Select Sum(customer_costs.totalpr
Then use the same values for all your calculations.
$Profit = $customercosts - $actualcosts;
$Margin = $Profit / $customercosts;
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Question
SQL use of alias for SUM
Hello all!
I am having issues using the alias for a SUM later in my SQL SELECT statement.
What I am trying to get to work is:
SELECT (SELECT SUM(total_price) FROM customer_costs WHERE job_number = '46') - (SELECT SUM(total_price) FROM actual_costs WHERE job_number = '46') as profit, SUM(profit / (SELECT SUM(total_price) FROM customer_costs WHERE job_number = '46') as margin
I currently receive an error from MySQL saying it doesn't know what table profit comes from. As you can see, it is calculated above.
Also, would it be possible for me to alias (SELECT SUM(total_price) FROM customer_costs WHERE job_number = '46') as cust_total and use it in the division with profit to make the margin (so I don't have to repeat what's already written in the first subquery)?
Is there some way to do what I am attempting to do without restating the same SQL to recreate the value for profit again? Thanks for your help!
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by: angelIIIPosted on 2007-04-20 at 08:51:42ID: 18947351
yes, but mysql cannot directly use column aliases.
honestly, I would NOT try to solve that in (my)SQL directly, but in front-end code ...
in MSSQL or ORACLE, this would be much easier, but MySQL is still a bit new for such kind of syntax