Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>A possible SQL version:</p> <pre><code>WITH CTE AS( SELECT ROW_NUMBER()OVER(PARTITION BY [Name] ORDER BY [Time])As RowNum , * FROM @table T ) SELECT DiffSec=DATEDIFF(s,[Time],(SELECT [Time] FROM CTE c2 WHERE c2.[Name]=CTE.[Name] AND c2.RowNum=CTE.RowNum+1)) , [Name] , Mood , [Time] FROM CTE ORDER BY [Name],[RowNum] </code></pre> <p>Result:</p> <pre><code>DiffSec Name Mood Time 1678 Andy Happy 2012-06-11 14:06:07.000 NULL Andy Sad 2012-06-11 14:34:05.000 5228 Arthur Angry 2012-06-11 14:06:57.000 NULL Arthur Happy 2012-06-11 15:34:05.000 </code></pre> <p>Your test data:</p> <pre><code>declare @table table(name varchar(10),mood varchar(10),time datetime); insert into @table values('Andy','Happy',convert(datetime,'11.06.2012 14:06:07',104)); insert into @table values('Arthur','Angry',convert(datetime,'11.06.2012 14:06:57',104)); insert into @table values('Andy','Sad',convert(datetime,'11.06.2012 14:34:05',104)); insert into @table values('Arthur','Happy',convert(datetime,'11.06.2012 15:34:05',104)); </code></pre> <hr> <p><strong>Edit</strong> Self-Joining a <code>CTE</code> seems to be a very bad idea (<em>"<a href="http://dbaspot.com/sqlserver-programming/379487-cte-vs-temp-tables.html" rel="nofollow">If you self join the CTE it will kill you</a>"</em>). I've tested my query with 500000 records in a temporary table and cancelled the query after 30 minutes.</p> <p>Here's a much faster approach(4 seconds for all) using a sub-query (with your commented schema):</p> <pre><code>SELECT T.* ,(SELECT DATEDIFF(s,MAX(T2.Time),T.Time) FROM dbo.Temp T2 WHERE T2.HE_Id = T.HE_Id AND T2.Time &lt; T.Time ) AS DiffSec FROM dbo.Temp AS T ORDER BY HE_Id ,DiffSec </code></pre>
    singulars
    1. This table or related slice is empty.
    1. POCalculate time duration between differents records in a table based on datetimes
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USTim Schmelter
    1. USTim Schmelter
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POCalculate time duration between differents records in a table based on datetimes
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COAnd with Denali / SQL 2012, you now have LEAD() and LAG() with partitions.
      singulars
      1. PO
      1. USStuartLC
    2. COHey, thanks for your answer ! I tried it, by simply copy-pasting it and adapating it on my table. My table actually store more than 500'000 entries and this query has been running for nearly 10 minutes without giving us an answer... I'll try and simplying a bit but looks like it's too heavy... Note: We have a 16 core server with 32 go of ram... :)
      singulars
      1. PO
      1. USAndy M
    3. CO... but, on the example you gave, it's exactely what we do need ! The last records have null entry on the DiffSec common, except for the process duration, it looks perfect !
      singulars
      1. PO
      1. USAndy M
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload