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POfind first row based on a cycle size
 

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    <p>I have a table of cards and a table of moves (on a card), like:</p> <pre><code>declare @cards table ( id_card int, cycle int ) insert into @cards (id_card, cycle) values (1, 10) declare @moves table ( id_move int, id_card int, quantity int ) insert into @moves (id_move, id_card, quantity) values (1, 1, 2) insert into @moves (id_move, id_card, quantity) values (2, 1, 4) insert into @moves (id_move, id_card, quantity) values (3, 1, 2) insert into @moves (id_move, id_card, quantity) values (4, 1, 8) insert into @moves (id_move, id_card, quantity) values (5, 1, 2) </code></pre> <p>The problem: each card gets a cycle size, and each move gets a quantity. So, a card cycle size 10 and 18 moves means 1 full cycle plus 8 moves. I have to find the last cycle first move (the move id 4 in the given example). The problem sounds (at first) trivial, but I'm getting so many troubles to find the move that I think I'm doing something very wrong.</p> <p>I came up with a query that gives where the last cycle first move starts position, but I'm not finding anywhere to go from there.</p> <pre><code>select id_card, case when value &gt; quantity then value - quantity else value end value from ( select f.id_card, f.quantity, f.quantity - f.quantity % cards.cycle + 1 value from ( select id_card, sum(quantity) quantity from @moves group by id_card ) f join @cards cards on cards.id_card = f.id_card ) f </code></pre> <p>Expected output:</p> <pre><code>id_move 4 </code></pre> <p>Any ideas? I can make any modifications to make the problem easier.</p>
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