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Submitted by: Hannes du Preez(ojdupreez1978@gmail.com)

Thursday Apr 19th 2018 by Hannes du Preez

Language: SQL, Level: Beginner: - Check out a quick way to access information from the previous row or next row from the current row.

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
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