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plurals

PO
primarykey
Id
140596
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2008-09-26T16:38:16.943
FavoriteCount
0
LastActivityDate
2008-09-26T20:17:18.477
LastEditDate
2008-09-26T20:17:18.477
LastEditorUserId
5696608
OwnerUserId
5696608
ParentId
140205
PostTypeId
2
Score
2
ViewCount
0
LastEditorDisplayName
Tom H.
text
Body
<p>The following code should work. I've made a few assumptions as follows: there are no overlaps of date ranges, there are no NULL values in any of the fields, and the start date for a given row is always less than the end date. If your data doesn't fit these criteria, you'll need to adjust this method, but it should point you in the right direction.</p> <p>You can use subqueries instead of the views, but that can be cumbersome so I used the views to make the code clearer.</p> <pre><code>CREATE VIEW dbo.StudentStartDates AS SELECT S.StudentID, S.StartDate, S.Field1, S.Field2 FROM dbo.Students S LEFT OUTER JOIN dbo.Students PREV ON PREV.StudentID = S.StudentID AND PREV.Field1 = S.Field1 AND PREV.Field2 = S.Field2 AND PREV.EndDate = DATEADD(dy, -1, S.StartDate) WHERE PREV.StudentID IS NULL GO CREATE VIEW dbo.StudentEndDates AS SELECT S.StudentID, S.EndDate, S.Field1, S.Field2 FROM dbo.Students S LEFT OUTER JOIN dbo.Students NEXT ON NEXT.StudentID = S.StudentID AND NEXT.Field1 = S.Field1 AND NEXT.Field2 = S.Field2 AND NEXT.StartDate = DATEADD(dy, 1, S.EndDate) WHERE NEXT.StudentID IS NULL GO SELECT SD.StudentID, SD.StartDate, ED.EndDate, SD.Field1, SD.Field2 FROM dbo.StudentStartDates SD INNER JOIN dbo.StudentEndDates ED ON ED.StudentID = SD.StudentID AND ED.Field1 = SD.Field1 AND ED.Field2 = SD.Field2 AND ED.EndDate > SD.StartDate AND NOT EXISTS (SELECT * FROM dbo.StudentEndDates ED2 WHERE ED2.StudentID = SD.StudentID AND ED2.Field1 = SD.Field1 AND ED2.Field2 = SD.Field2 AND ED2.EndDate < ED.EndDate AND ED2.EndDate > SD.StartDate) GO </code></pre>
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1. POCombining split date ranges in a SQL query
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1. USTom H
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1. POCombining split date ranges in a SQL query
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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.