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plurals

PO
primarykey
Id
17473495
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2013-07-04T15:03:40.620
FavoriteCount
0
LastActivityDate
2013-07-04T16:34:36.170
LastEditDate
2013-07-04T16:34:36.170
LastEditorUserId
375799
OwnerUserId
375799
ParentId
17448813
PostTypeId
2
Score
3
ViewCount
0
LastEditorDisplayName
text
Body
This query uses CTEs to: <ol> <li>Create an ordered collection of records grouped by Registration</li> <li>For each record, capture the data of the previous record</li> <li>Compare current and previous data to determine if the current record is a new instance of a driver / trailer assignment</li> <li>Get only the new records</li> <li>For each new record, get the last date before a new driver / trailer assignment occurs</li> </ol> Link to <a href="http://sqlfiddle.com/#!3/b8592/2/0" rel="nofollow">SQL Fiddle</a> Code below: <pre><code>;WITH c AS ( -- Group records by Registration, assign row numbers in order of date SELECT ROW_NUMBER() OVER ( PARTITION BY Registration ORDER BY Registration, [Date]) AS Rn, Registration, [Date], DriverID, TrailerID FROM TempTable ) ,c2 AS ( -- Self join to table to get Driver and Trailer from previous record SELECT t1.Rn, t1.Registration, t1.[Date], t1.DriverID, t1.TrailerID, t2.DriverID AS PrevDriverID, t2.TrailerID AS PrevTrailerID FROM c t1 LEFT OUTER JOIN c t2 ON t1.Registration = t2.Registration AND t2.Rn = t1.Rn - 1 ) ,c3 AS ( -- Use INTERSECT to determine if this record is new in sequence SELECT Rn, Registration, [Date], DriverID, TrailerID, CASE WHEN NOT EXISTS ( SELECT DriverID, TrailerID INTERSECT SELECT PrevDriverID, PrevTrailerID) THEN 1 ELSE 0 END AS IsNew FROM c2 ) -- For all new records in sequence, -- get the last date logged before a new record appeared SELECT Registration, [Date] AS StartDate, COALESCE ( ( SELECT TOP 1 [Date] FROM c3 WHERE Registration = t.Registration AND Rn < ( SELECT TOP 1 Rn FROM c3 WHERE Registration = t.Registration AND Rn > t.Rn AND IsNew = 1 ORDER BY Rn ) ORDER BY Rn DESC ) , [Date]) AS EndDate, DriverID, TrailerID FROM c3 t WHERE IsNew = 1 ORDER BY Registration, StartDate </code></pre>
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Title
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POHow to group together sequential, timestamped rows in SQL and return the date range for each group
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 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. US8kb
UserOwnerUserId
1. US8kb
plurals
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PostLinksRelatedPostIdPostId
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PostsAcceptedAnswerId
1. POHow to group together sequential, timestamped rows in SQL and return the date range for each group
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1. VO
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3. VO
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