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POHow to group rows by their DATEDIFF?
 

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  1. POHow to group rows by their DATEDIFF?
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    <p>I hope you can help me. </p> <p>I need to display the records in HH_Solution_Audit table -- if 2 or more staffs enter the room within 10 minutes. Here are the requirements:</p> <ol> <li>Display only the events that have a timestamp (LAST_UPDATED) interval of less than or equal to 10 minutes. Therefore, I must compare the current row to the next row and previous row to check if their DATEDIFF is less than or equal to 10 minutes. I’m done with this part.</li> <li>Show only the records if the number of distinct STAFF_GUID inside the room for less than or equal to 10 minutes is at least 2. </li> </ol> <p><strong>HH_Solution_Audit Table Details:</strong> </p> <ol> <li>ID - PK </li> <li>STAFF_GUID - staff id</li> <li>LAST_UPDATED - datetime when a staff enters a room</li> </ol> <p>Here's what I got so far. This satisfies requirement # 1 only.</p> <pre><code>CREATE TABLE HH_Solution_Audit ( ID INT PRIMARY KEY, STAFF_GUID NVARCHAR(1), LAST_UPDATED DATETIME ) GO INSERT INTO HH_Solution_Audit VALUES (1, 'b', '2013-04-25 9:01') INSERT INTO HH_Solution_Audit VALUES (2, 'b', '2013-04-25 9:04') INSERT INTO HH_Solution_Audit VALUES (3, 'b', '2013-04-25 9:13') INSERT INTO HH_Solution_Audit VALUES (4, 'a', '2013-04-25 10:15') INSERT INTO HH_Solution_Audit VALUES (5, 'a', '2013-04-25 10:30') INSERT INTO HH_Solution_Audit VALUES (6, 'a', '2013-04-25 10:33') INSERT INTO HH_Solution_Audit VALUES (7, 'a', '2013-04-25 10:41') INSERT INTO HH_Solution_Audit VALUES (8, 'a', '2013-04-25 11:02') INSERT INTO HH_Solution_Audit VALUES (9, 'a', '2013-04-25 11:30') INSERT INTO HH_Solution_Audit VALUES (10, 'a', '2013-04-25 11:45') INSERT INTO HH_Solution_Audit VALUES (11, 'a', '2013-04-25 11:46') INSERT INTO HH_Solution_Audit VALUES (12, 'a', '2013-04-25 11:51') INSERT INTO HH_Solution_Audit VALUES (13, 'a', '2013-04-25 12:24') INSERT INTO HH_Solution_Audit VALUES (14, 'b', '2013-04-25 12:27') INSERT INTO HH_Solution_Audit VALUES (15, 'b', '2013-04-25 13:35') </code></pre> <hr> <pre><code> DECLARE @numOfPeople INT = 2, --minimum number of people that must be inside --the room for @lengthOfStay minutes @lengthOfStay INT = 10, --number of minutes of stay @dateFrom DATETIME = '04/25/2013 00:00', @dateTo DATETIME = '04/25/2013 23:59'; WITH cteSource AS ( SELECT ID, STAFF_GUID, LAST_UPDATED, ROW_NUMBER() OVER (ORDER BY LAST_UPDATED) AS row_num FROM HH_SOLUTION_AUDIT WHERE LAST_UPDATED &gt;= @dateFrom AND LAST_UPDATED &lt;= @dateTo ) SELECT [current].ID, [current].STAFF_GUID, [current].LAST_UPDATED FROM cteSource AS [current] LEFT OUTER JOIN cteSource AS [previous] ON [current].row_num = [previous].row_num + 1 LEFT OUTER JOIN cteSource AS [next] ON [current].row_num = [next].row_num - 1 WHERE DATEDIFF(MINUTE, [previous].LAST_UPDATED, [current].LAST_UPDATED) &lt;= @lengthOfStay OR DATEDIFF(MINUTE, [current].LAST_UPDATED, [next].LAST_UPDATED) &lt;= @lengthOfStay ORDER BY [current].ID, [current].LAST_UPDATED </code></pre> <hr> <p>Running the query returns IDs:<br> <strong>1, 2, 3, 5, 6, 7, 10, 11, 12, 13, 14</strong><br> That satisfies requirement # 1 of having less than or equal to 10 minutes interval between the previous row, current row and next row. </p> <p>Can you help me with the 2nd requirement? If it's applied, the returned IDs should only be:<br> <strong>13, 14</strong></p>
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    1. USRaii
    1. USRaii
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      1. POHow to group rows by their DATEDIFF?
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    2. VO
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      1. POHow to group rows by their DATEDIFF?
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    3. VO
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    1. COCan you setup a sample data? Few rows and expected result on them?
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      1. USNenad Zivkovic
    2. COThe question is really god, and I can see that you really try, but we could help you more if you put some examples. Thanks!
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      1. USGianlucaBobbio
    3. CO@NenadZivkovic Hi Nenad. I added a sample data and expected result as you requested. Thank you. I forgot about that.
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