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SQL query to show previous row and current row values
Posted on 2011-03-08
i got some helps here a couple of days ago about how to get aSQL query to compare the previous row and current values.
Now, I need to display the previous row and current row.
attached is the code and the example table. thanks
here is the desired output
pid MDATE MHEIGHT Serial FLAG
--------------------------
1 13-Jul-10 62.5 4
1 7-Aug-10 60 5 FLAG
4 21-Apr-10 57.5 23
4 23-May-10 55.9 24 FLAG
5 21-Apr-10 69.2 31
5 19-May-10 58.6 32 FLAG
prev-current-row.xlsx
Now, I need to display the previous row and current row.
attached is the code and the example table. thanks
here is the desired output
pid MDATE MHEIGHT Serial FLAG
--------------------------
1 13-Jul-10 62.5 4
1 7-Aug-10 60 5 FLAG
4 21-Apr-10 57.5 23
4 23-May-10 55.9 24 FLAG
5 21-Apr-10 69.2 31
5 19-May-10 58.6 32 FLAG
prev-current-row.xlsx
WITH CTE AS
(
SELECT *, ROW_NUMBER() OVER(ORDER BY pid, MDATE ) Serial FROM #table
)
SELECT x.*, CASE WHEN y.pid IS NOT NULL THEN 'FLAG' ELSE '' END FLAG FROM CTE x
LEFT JOIN
(
SELECT a.*
FROM CTE a
LEFT JOIN CTE b ON a.Serial - 1 = b.Serial AND a.pid = b.pid
WHERE b.MHEIGHT > a.MHEIGHT
) y ON x.pid = y.pid AND x.MDATE = y.MDATE
[X]
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6 Comments
hi
you could use a CURSOR and use the Previos and Next commands to retrive you data.
example :http://www.mssqltips.com/tip.asp?tip=1599
you could use a CURSOR and use the Previos and Next commands to retrive you data.
example :http://www.mssqltips.com/tip.asp?tip=1599
How about this code?
WITH CTE AS
(
SELECT *, ROW_NUMBER() OVER(ORDER BY pid, MDATE ) Serial FROM #table
)
SELECT x.*, CASE x.Serial WHEN Sub.Serial THEN 'FLAG' ELSE '' END PLAG
FROM CTE x
INNER JOIN
(
SELECT a.*, b.Serial SerialB
FROM CTE a
LEFT JOIN CTE b ON a.Serial - 1 = b.Serial AND a.pid = b.pid
WHERE b.MHEIGHT > a.MHEIGHT
) Sub ON x.Serial IN (Sub.Serial, Sub.SerialB)
ORDER BY x.Serial
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