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Asked by BenjaminWong in Databases Miscellaneous, MS SQL Server
I have been trying to extract records of students who have been absent from class consectively but could not get it right. Let me refer to the example below to elaborate what I tried to achieve :
In the table below, I should only extract the records for :
- 2 June as the student has been absent fromclass for 2 lessons consecutively.
- 4 June record should be excluded as there was only one absent
- 5 & 7 June should be included as the student again absent consectively
studentno LessonDate LessonTime Status
St0012345 1-Jun-09 8.30am Present
2-Jun-09 8.30am Absent
2-Jun-09 10.30am Absent
3-Jun-09 8.30am Present
4-Jun-09 9.30am Absent
4-Jun-09 10.30am Present
5-Jun-09 8 .30am Absent
7-Jun-09 9.30am Absent
1:
2:
3:
4:
5:
6:
7:
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select a.studentid,a.lessondate,a.lessontime,a.status
from Tableattendance a inner join
tableattendance b on a.studentid=b.studentid
and a.lessondate>'01/06/2009'
and a.status='Absent'
and ((a.lessondate=b.lessondate and a.lessontime<b.lessontime) or
(a.lessondate<b.lessondate))
|
20091021-EE-VQP-81 - Hierarchy / EE_QW_3_20080625
