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7.6

SQL SUM and Join

Asked by flow79 in PHP Scripting Language

Tags: sql, sum, join

Hello all!

I am working to create a small report from our data to determine the profit per job. In doing so, I have two tables customer_costs and actual_costs. The profit can be found by adding the total_price fields per job_number in each table, and then subtracting these sums. You will see the SQL syntax below.

My issue is this: Whenever I run this query, the answer is double the actual number desired. I will display an example of each table to illustrate the correct numbers below, and then show you what is actually output by the query.

table: customer_costs
------------------------------------------------------------------
ID | job_number | total_price
------------------------------------------------------------------
1 | 46 | 135.00
------------------------------------------------------------------
2 | 46 | 247.50
------------------------------------------------------------------

table: actual_costs
------------------------------------------------------------------
ID | job_number | total_price
------------------------------------------------------------------
1 | 46 | 101.25
------------------------------------------------------------------
2 | 46 | 180.00
------------------------------------------------------------------

As you can see the total customer_cost for job_number 46 is: 382.50. And the total actual_cost is: 281.25

Thus the profit should be: 382.50 - 281.25 = 101.25

The SQL statement below gives me: 202.50 (double the real amount). Anyone know why the sum is doubled? is it due to how many tables are in the join? If so, how do I work around this (other than simply sub-querying each)?

SELECT SUM(cc.total_price - ac.total_price) FROM customer_costs cc, actual_costs ac WHERE cc.job_number = ac.job_number AND cc.job_number = '46'

Thanks!

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20091021-EE-VQP-81

SQL SUM and Join

Asked by flow79 in PHP Scripting Language

Tags: sql, sum, join

About this solution