Question

Need a query to select where the next row in the table is lower in value to the previous row

Asked by: wint100

I have attached the data from my datatable with the sample data for OCtober.

You can see that the Data column is increasing in value every 15min. This is the correct operation of the system. A new value is added to the Data column every 15min, and the timestamp logged.

You will notice that I've highlighted some of the rows in yellow. These rows have Mistakenly been modified by myself by using a duff query. You will also notice that the highlighted rows have a larger increase, and the value is higher than the next record, which is my problem.

I need a query to scan through all of the records and return the Data, recordnumber and timestamp where the problem rows exist. i.e. have a greater 'Data' value than the next row (e.g. row 5 has a larger value than row 6)

Hope this is enough detail.

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Asked On
2009-10-27 at 13:18:35ID24848712
Topics

MS SQL Server

,

SQL Query Syntax

Participating Experts
2
Points
500
Comments
2

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Answers

 

by: aneeshattingalPosted on 2009-10-27 at 13:26:58ID: 25677048

select *
from Tbal a
where exists (select 1 from tbal b where a.recordnumber+1 = b.recordnumber and a.TLInstance
 = b.TLInstance
 and a.data > b.data )

 

by: mcmonapPosted on 2009-10-27 at 13:32:28ID: 25677104

Slower than aneeshattinga!...and slightly different but essentially the same

SELECT
	a.*
	, b.*
FROM
	yourTable a
	JOIN yourTable b ON a.recordnumber = b.recordnumber + 1
WHERE
	a.data > b.data

                                              
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