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POTSQL recursion - max recursion error with duplitace values in table
 

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  1. POTSQL recursion - max recursion error with duplitace values in table
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    <p>Related question: <a href="https://stackoverflow.com/questions/9738777/tsql-check-if-specific-rows-sequence-exists/9739670">TSQL check if specific rows sequence exists</a></p> <p>I'm asking second question about recursion, because this time it is different thing (in my opinion) so please don't delete it.</p> <p>I have table containing values:</p> <pre><code>ORDER_ID Previous_STATUS_ID Next_STATUS_ID Create_Date 2 null 1 '2012-01-02' 2 1 2 '2012-01-03' 2 2 3 '2012-01-04' 2 3 1 '2012-01-05' 3 1 2 '2012-01-06' 2 2 3 '2012-01-10' 2 3 5 '2012-01-13' 2 5 1 '2012-01-22' 2 1 2 '2012-01-22' </code></pre> <p>This works fine:</p> <pre><code>with change_tree as ( SELECT order_id, previous_status_id, next_status_id, cast(next_status_id as varchar(max)) as status_path FROM status_change WHERE previous_status_id = 5 AND order_id = 2 UNION ALL SELECT sc.order_id, sc.previous_status_id, sc.next_status_id, ct.status_path + ',' + cast(sc.next_status_id as varchar(max)) FROM status_change sc JOIN change_tree ct ON ct.next_status_id = sc.previous_status_id AND ct.order_id = sc.order_id ) SELECT * FROM change_tree WHERE status_path = '5,1'; </code></pre> <p>But if I modify it like so:</p> <pre><code>with change_tree as ( SELECT sc.order_id, sc.previous_status_id, sc.next_status_id, cast(sc.next_status_id as varchar(max)) as status_path, sc.Create_Date as StartDate, sc.Create_Date as EndDate FROM status_change sc WHERE previous_status_id = 1 AND order_id = 2 UNION ALL SELECT sc.order_id, sc.previous_status_id, sc.next_status_id, ct.status_path + ',' + cast(sc.next_status_id as varchar(max)) sc.Create_Date as StartDate, st.Create_Date as EndDate FROM status_change sc JOIN change_tree ct ON ct.next_status_id = sc.previous_status_id AND ct.order_id = sc.order_id ) SELECT * FROM change_tree WHERE status_path = '1,2,3'; </code></pre> <p>I get max recursion error.</p> <p>This is kind of data that I'm expecting to get:</p> <pre><code>ORDER_ID StartDate EndDate 2 '2012-01-02' '2012-01-04' 2 '2012-01-05' '2012-01-10' </code></pre> <p>This will be done as a report. So I was thinking about storing results in another table and in the night doing only those orders that are new or for which sequence of statuses has ended.</p> <p>So in my report table I must have those two records, and after adding next record to status_change table like:</p> <pre><code>ORDER_ID Previous_STATUS_ID Next_STATUS_ID Create_Date 2 2 3 '2012-02-25' </code></pre> <p>My procedure (function should add to report table only last sequence). Hope You'll get my point :)</p>
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