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POSQL select some rows in a table so that they sum up to certain value
 

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  1. POSQL select some rows in a table so that they sum up to certain value
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    <p>How can I select just some rows in the following table so that they sum up to certain value?</p> <pre><code>Table ----- id | qty1 | qty2 | qty3 | qty4 ------------------------------ 1 | 0.0 | 0.0 | 10 | 20 2 | 1.5 | 0.0 | 7.5 | 18 3 | 1.0 | 2.0 | 7.5 | 18 4 | 0.0 | 0.5 | 5 | 13 </code></pre> <p>Let's say, the top value I want is 57...</p> <p>So I need to select the rows from the previous table such that qty1+qty2+qty3+qty4 of each row, get until that 57 value, and discard the other rows. In this example, I would get the following:</p> <pre><code>id | qty1 | qty2 | qty3 | qty4 ------------------------------ 1 | 0.0 | 0.0 | 10 | 20 2 | 1.5 | 0.0 | 7.5 | 18 </code></pre> <p>Because 10+20+1.5+7.5+18 = 57, so I discard rows 3 &amp; 4...</p> <p>Now I wish that the top value is 50, then I should get:</p> <pre><code>id | qty1 | qty2 | qty3 | qty4 ------------------------------ 1 | 0.0 | 0.0 | 10 | 20 2 | 1.5 | 0.0 | 7.5 | 11 </code></pre> <p>Since these values sum up to 50, and the 7 from row2,qty4 is left out... (BTW the rows are ordered in this particular way because that's the order in which I wish to account for the sums of qtys... It's not valid to sum up first row1, then 3, then 2 then 4, for example... They should always be sumed in the order 1,2,3,4...)</p> <p>What if I would like the complement of this? I mean, the other two rows I didn't got in the last result.</p> <p>First case:</p> <pre><code>id | qty1 | qty2 | qty3 | qty4 ------------------------------ 3 | 1.0 | 2.0 | 7.5 | 18 4 | 0.0 | 0.5 | 5 | 13 </code></pre> <p>Second case:</p> <pre><code>id | qty1 | qty2 | qty3 | qty4 ------------------------------ 2 | 0.0 | 0.0 | 0.0 | 7 3 | 1.0 | 2.0 | 7.5 | 18 4 | 0.0 | 0.5 | 5 | 13 </code></pre> <p>(If the second case is too complicated, how about obtaining:</p> <pre><code>id | qty1 | qty2 | qty3 | qty4 ------------------------------ 1 | 0.0 | 0.0 | 10 | 20 </code></pre> <p>Because adding up the original qtys of row 2 would surpass the 50 value, I discard it... The complement in this case should just be:</p> <pre><code>id | qty1 | qty2 | qty3 | qty4 ------------------------------ 2 | 1.5 | 0.0 | 7.5 | 18 3 | 1.0 | 2.0 | 7.5 | 18 4 | 0.0 | 0.5 | 5 | 13 </code></pre> <p>)</p>
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    1. USJavier Novoa C.
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      1. POSQL select some rows in a table so that they sum up to certain value
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    1. COI've written lots of complex queries, and I like taking on a challenge, but this is one of those rare cases that just begs for you to write procedural code in the language of your choice.
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      1. USJohn Pick
    2. COeven for the simplified second case? the last ones in parentheses at the end of the post... ?
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      1. USJavier Novoa C.
    3. COThe simplified second case is doable as a query. If you modify your question to ask for just that (or create a new question that asks for just that), I can help.
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      1. USJohn Pick
 

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