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Tip of the Day
Language: SQL
Expertise: Beginner
Apr 19, 2018

WEBINAR:

On-Demand

Application Security Testing: An Integral Part of DevOps


Access Previous Row Value and Next Row Value

There are times that you need to access information from the previous row or next row from the current row. Here is a small trick that makes use of a CTE to get this information:

WITH c AS (
SELECT
rownum = ROW_NUMBER() OVER (ORDER BY t.ID),
t.FirstName,
t.Surname
FROM Table t
)

SELECT
p.FirstName PreviousName,
c.FirstName CurrentName,
n.FirstName NextName
FROM c

LEFT JOIN c p ON p.rownum = c.rownum - 1
LEFT JOIN c n ON n.rownum = c.rownum + 1
GO
Hannes du Preez
 
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