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POSelect duplicate records created within a few minutes of the first
 

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  1. POSelect duplicate records created within a few minutes of the first
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    <p>My company has been receiving duplicate records in a database that are created up to 4 minutes after the first. Logically speaking, a group of records consists of the original record plus any subsequent records that were created within that 4 minute time frame. The initial record gets a <code>TO_DELETE</code> value of <code>'N'</code>, while each duplicate record gets a <code>TO_DELETE</code> value of <code>'Y'</code>. Each new group starts over with an <code>'N'</code> value.</p> <p>With the help of <a href="https://stackoverflow.com/questions/11839893/deleting-invalid-duplicate-rows-in-sql">Deleting Invalid Duplicate Rows in SQL</a>, I've put together a query to select them but it's been running for over 2 hours and has yet to return a result set so I'm not sure if it's caught in an infinite loop. Any help identifying issues with it would be appreciated!</p> <pre><code>with LEAD_CTE as ( select *, ROW_NUMBER() over (partition by LASTNAME, FIRSTNAME, EMAIL, PRIMARY_PHONE, PROGRAMX, TERM_CODE, INQ_TYPE, LEADSOURCE order by CREATEDDATE) as ROWNUMBER from LEAD where DELETE_FLAG &lt;&gt; 'Y' and CREATEDDATE &gt;= (GETDATE() - 7) ), CTE as ( select ROWNUMBER, 'N' as TO_DELETE, CREATEDDATE, 0 as TOTAL_MINUTES, LASTNAME, FIRSTNAME, EMAIL, PRIMARY_PHONE, PROGRAMX, TERM_CODE, INQ_TYPE, LEADSOURCE from LEAD_CTE where ROWNUMBER = 1 union all select l.ROWNUMBER, case when ((c.TOTAL_MINUTES + DATEDIFF(MINUTE, c.CREATEDDATE, l.CREATEDDATE)) &gt; 4) then 'N' else 'Y' end as TO_DELETE, l.CREATEDDATE, case when ((c.TOTAL_MINUTES + DATEDIFF(MINUTE, c.CREATEDDATE, l.CREATEDDATE)) &gt; 4) then 0 else (c.TOTAL_MINUTES + DATEDIFF(MINUTE, c.CREATEDDATE, l.CREATEDDATE)) end as TOTAL_MINUTES, l.EMAIL, l.FIRSTNAME, l.LASTNAME, l.PRIMARY_PHONE, l.PROGRAMX, l.TERM_CODE, l.INQ_TYPE, l.LEADSOURCE from LEAD_CTE l inner join CTE c on l.ROWNUMBER = (c.ROWNUMBER + 1) ) select ROWNUMBER, TO_DELETE, CREATEDDATE, TOTAL_MINUTES, LASTNAME, FIRSTNAME, EMAIL, PRIMARY_PHONE, PROGRAMX, TERM_CODE, INQ_TYPE, LEADSOURCE from CTE order by LASTNAME, FIRSTNAME, EMAIL, PRIMARY_PHONE, PROGRAMX, TERM_CODE, INQ_TYPE, LEADSOURCE, CREATEDDATE </code></pre> <p>Sample data:</p> <pre><code>CREATEDDATE | LASTNAME | FIRSTNAME | EMAIL | PRIMARY_PHONE | PROGRAMX | TERM_CODE | INQ_TYPE | LEADSOURCE --------------------------------------------------------------------------------------------------------------------------------------------- 2013-09-24 00:06:01.000 | Testerson | Testy | test@test.com | (123) 867-5309 | MS in Higher Education | NULL | inquiry | Webform 2013-09-24 00:18:47.000 | Testerson | Testy | test@test.com | (123) 867-5309 | MS in Higher Education | NULL | inquiry | Webform 2013-09-24 00:18:50.000 | Testerson | Testy | test@test.com | (123) 867-5309 | MS in Higher Education | NULL | inquiry | Webform 2013-09-24 00:18:52.000 | Testerson | Testy | test@test.com | (123) 867-5309 | MS in Higher Education | NULL | inquiry | Webform 2013-09-24 00:18:52.000 | Testerson | Testy | test@test.com | (123) 867-5309 | MS in Higher Education | NULL | inquiry | Webform 2013-09-24 00:18:54.000 | Testerson | Testy | test@test.com | (123) 867-5309 | MS in Higher Education | NULL | inquiry | Webform 2013-09-24 00:18:55.000 | Testerson | Testy | test@test.com | (123) 867-5309 | MS in Higher Education | NULL | inquiry | Webform 2013-09-24 00:18:56.000 | Testerson | Testy | test@test.com | (123) 867-5309 | MS in Higher Education | NULL | inquiry | Webform 2013-09-24 00:18:56.000 | Testerson | Testy | test@test.com | (123) 867-5309 | MS in Higher Education | NULL | inquiry | Webform </code></pre> <p>New CTE with self-join:</p> <pre><code>with LEAD_CTE as ( select *, ROW_NUMBER() over (partition by LASTNAME, FIRSTNAME, EMAIL, PRIMARY_PHONE, PROGRAMX, TERM_CODE, INQ_TYPE, LEADSOURCE order by CREATEDDATE) as ROWNUMBER from LEAD where DELETE_FLAG &lt;&gt; 'Y' and CREATEDDATE &gt;= (GETDATE() - 7) ) select l1.ROWNUMBER, l1.CREATEDDATE, l2.CREATEDDATE, DATEDIFF(MINUTE, l1.CREATEDDATE, l2.CREATEDDATE), l1.LASTNAME, l1.FIRSTNAME, l1.EMAIL, l1.PRIMARY_PHONE, l1.PROGRAMX, l1.TERM_CODE, l1.INQ_TYPE, l1.LEADSOURCE from LEAD_CTE l1 left join LEAD_CTE l2 on l1.ROWNUMBER = (l2.ROWNUMBER + 1) and l1.LASTNAME = l2.LASTNAME and l1.FIRSTNAME = l2.FIRSTNAME and l1.EMAIL = l2.EMAIL and l1.PRIMARY_PHONE = l2.PRIMARY_PHONE and l1.PROGRAMX = l2.PROGRAMX and l1.TERM_CODE = l2.TERM_CODE and l1.INQ_TYPE = l2.INQ_TYPE and l1.LEADSOURCE = l2.LEADSOURCE order by l1.ROWNUMBER </code></pre> <p>Actual output:</p> <pre><code>ROWNUMBER | CREATEDDATE | CREATEDDATE | (no column name) | LASTNAME | FIRSTNAME | EMAIL | PRIMARY_PHONE | PROGRAMX | TERM_CODE | INQ_TYPE | LEADSOURCE ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ 1 | 2013-09-24 00:06:01.000 | NULL | NULL | Testerson | Testy | test@test.com | (123) 867-5309 | MS in Higher Education | NULL | inquiry | Webform 2 | 2013-09-24 00:18:47.000 | NULL | NULL | Testerson | Testy | test@test.com | (123) 867-5309 | MS in Higher Education | NULL | inquiry | Webform 3 | 2013-09-24 00:18:50.000 | NULL | NULL | Testerson | Testy | test@test.com | (123) 867-5309 | MS in Higher Education | NULL | inquiry | Webform 4 | 2013-09-24 00:18:52.000 | NULL | NULL | Testerson | Testy | test@test.com | (123) 867-5309 | MS in Higher Education | NULL | inquiry | Webform 5 | 2013-09-24 00:18:52.000 | NULL | NULL | Testerson | Testy | test@test.com | (123) 867-5309 | MS in Higher Education | NULL | inquiry | Webform 6 | 2013-09-24 00:18:54.000 | NULL | NULL | Testerson | Testy | test@test.com | (123) 867-5309 | MS in Higher Education | NULL | inquiry | Webform 7 | 2013-09-24 00:18:55.000 | NULL | NULL | Testerson | Testy | test@test.com | (123) 867-5309 | MS in Higher Education | NULL | inquiry | Webform 8 | 2013-09-24 00:18:56.000 | NULL | NULL | Testerson | Testy | test@test.com | (123) 867-5309 | MS in Higher Education | NULL | inquiry | Webform 9 | 2013-09-24 00:18:56.000 | NULL | NULL | Testerson | Testy | test@test.com | (123) 867-5309 | MS in Higher Education | NULL | inquiry | Webform </code></pre> <p>What's interesting is all l2 fields in every record come in as <code>NULL</code>, which I found as a result of the <code>DATEDIFF()</code> calculations returning <code>NULL</code> as well. My expected output would be that all l2 fields would have the values of the next l1 record, with the exception of the last record's l2 fields, which would be <code>NULL</code>.</p>
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    1. COYou're recursive cte looks like the cause. I would do a self join like `from lead_cte t1 left join lead_cte t2 on t1.row_numer = t2.row_numer +1 and t1.lastname = t2.lastnsame and ... the rest of the partitioned fields`
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    2. COYour issue is probably a perf one. Try creating temp tables and index on row number you will get better performace. If you have a ton of rows and no index your query is going to be extremely slow.
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    3. CO@ConradFrix If I use a self-join my groups consist of records that are outside of that 4 minute mark in either direction (either too early or too late).
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