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POPartial sum and subtraction (minus) in UNION Query
 

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    <p>I have two similar tables (one for bills, the other payments) right now I show to users a union mixing data from both..</p> <pre><code>Table Bills CustomerId Amount 1 100 2 100 1 100 2 100 Table Payments CustomerId Amount 1 100 2 100 1 100 </code></pre> <p>Right now my users can see the following informtation</p> <pre><code>From Customer 1 Type CustomerId Amount B 1 100 P 1 -100 B 1 100 P 1 -100 TOTAL 0 From Customer 2 Type CustomerId Amount B 1 100 P 1 -100 B 1 100 Total 100 </code></pre> <p>Everything works fine using UNION Statement</p> <p>Right now I need to show Partial Balance on each record so users can keep in mind balanca while they are looking at records..</p> <p>Like this... (DESIRED)</p> <pre><code>From Customer 1 Type CustomerId Amount Partial B 1 100 100 P 1 -100 0 B 1 100 100 P 1 -100 0 </code></pre> <p>I've alredy try using Variables like @Partial := @Partial + Amount but it seems that it first sum the first part (bills) and then the rest (payments)... like this...</p> <pre><code>From Customer 1 Type CustomerId Amount Partial B 1 100 100 P 1 -100 200 B 1 100 200 P 1 -100 100 </code></pre> <p>it seems that first sum everything from bills and then start subtraction... anyone knows how to solve it?</p> <p><em><strong></em>**<em>*</em>**<em>*</em></strong> // update // <strong><em>*</em>**<em>*</em>****</strong></p> <p>here original query ...</p> <p>(SELECT 'Bill' as cType , b.type, b.tal , 'Customer', b.number , b.date , b.subtot, b.tax, IF(b.type='CA' or b.type='CB' or b.type='CC' or b.type='CX',b.total*-1,b.total) as total FROM bills b WHERE b.idcustomer='000140') UNION ALL (SELECT 'Payment' as cType, 'CO' , '1' , '' , c.idcash , c.date , 0 ,0 , -c.amount FROM cash c WHERE c.idcustomer='000140' and ( c.type='CO' or c.type='DM') ) order by date asc;</p> <p>this brings something like this</p> <p>Bill FX 1 Customer 9 2011-02-25 0.00 0.00 100.00</p> <p>Payment CO 1 37 2011-03-04 0.00 0.00 -100.00</p> <p>Bill FX 1 Customer 616 2011-03-23 0.00 0.00 100.00</p> <p>Payment CO 1 751 2011-04-12 0.00 0.00 -100.00</p> <p>Bill FX 1 Customer 1267 2011-04-27 0.00 0.00 100.00</p> <p>Payment CO 1 1157 2011-05-10 0.00 0.00 -100.00</p> <p>Bill FX 1 Customer 1974 2011-05-26 0.00 0.00 100.00</p> <p>Payment CO 1 1654 2011-06-08 0.00 0.00 -100.00</p> <p>then When I try to sum patiars...using the following code</p> <p>set @running_total=0; (SELECT 'Bill' as cType , b.type, b.tal , 'Customer', b.number , b.date , b.subtot, b.tax, IF(b.type='CA' or b.type='CB' or b.type='CC' or b.type='CX',b.total*-1,b.total) as total, ( @running_total := @running_total + total) AS RunningTotal FROM bills b WHERE b.idcustomer='000140') UNION ALL (SELECT 'Payment' as cType, 'CO' , '1' , '' , c.idcash , c.date , 0 ,0 , -c.amount, ( @running_total := @running_total-c.amount) AS RunningTotal FROM cash c WHERE c.idcustomer='000140' and ( c.type='CO' or c.type='DM') ) order by date asc;</p> <p>results...</p> <p>Bill FX 1 Customer 9 2011-02-25 0.00 0.00 100.00 100.00</p> <p>Payment CO 1 37 2011-03-04 0.00 0.00 -100.00 1905.00</p> <p>Bill FX 1 Customer 616 2011-03-23 0.00 0.00 100.00 200.00</p> <p>Payment CO 1 751 2011-04-12 0.00 0.00 -100.00 1805.00</p> <p>Bill FX 1 Customer 1267 2011-04-27 0.00 0.00 100.00 300.00</p> <p>Payment CO 1 1157 2011-05-10 0.00 0.00 -100.00 1705.00</p> <p>As you Can See seems to sum first all from bills and then start substraccion from payments...</p>
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    1. COWhat you want is a running total. Also, make sure you want to use `UNION` and not `UNION ALL`.
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    2. COI'm currently using UNION.
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    3. COI'd like to do it on the fly by the MySql Query .. I can do it App's code but maybe someone knows how to solve it.. I'll coppy alter the mysql query I'm using right now so it's easy to understand.
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