How to modify Rank() function

Question

How to modify Rank() function

sanda.jan00

SSC Veteran

Points: 294
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March 12, 2017 at 5:39 pm

#335626

Hello,
I have troubles with this query:
SELECT
id,
SUM(repayment) as suma,
DATEADD(S, -1, DATEADD(mm,DATEDIFF (m,0,date+1,0)) AS obd
RANK() OVER(PARTITION BY id,suma, ORDER BY DATEADD(S, -1, DATEADD(mm,DATEDIFF (m,0,date+1,0)) asc) AS rank
FROM DDV.DBO.DATA
ORDER BY id, obd
which generates this result:
id   suma   obd   rank
1   0   1.1.2014   1
2   0   1.2.2014   2
3   0   1.3.2014   3
4   8   1.4.2014   1
5   0   1.5.2014   4
6   0   1.6.2014   5
I need to order it by id and suma and everytime when there is a different value in a column suma , the RANK should count from number 1 again. Using above mentioned result table - in a row with id=5 the rank should be 1 and not 4.
Could anybody help me with this please??
Thank you!

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ChrisM@Work SSC Guru Points: 186127 More actions · Answer 1

sanda.jan00 - Sunday, March 12, 2017 5:39 PM
Hello,
I have troubles with this query:
SELECT
id,
SUM(repayment) as suma,
DATEADD(S, -1, DATEADD(mm,DATEDIFF (m,0,date+1,0)) AS obd
RANK() OVER(PARTITION BY id,suma, ORDER BY DATEADD(S, -1, DATEADD(mm,DATEDIFF (m,0,date+1,0)) asc) AS rank
FROM DDV.DBO.DATA
ORDER BY id, obd
which generates this result:
id   suma   obd   rank
1   0   1.1.2014   1
2   0   1.2.2014   2
3   0   1.3.2014   3
4   8   1.4.2014   1
5   0   1.5.2014   4
6   0   1.6.2014   5
I need to order it by id and suma and everytime when there is a different value in a column suma , the RANK should count from number 1 again. Using above mentioned result table - in a row with id=5 the rank should be 1 and not 4.
Could anybody help me with this please??
Thank you!

Change the RANK() clause part to this:

Rn = ROW_NUMBER() OVER(PARTITION BY suma ORDER BY ID)

Use the output from this query either as a CTE or as aderived table. Subtract the new column Rn from ID, and use the result as a newpartition value for RANK().

If you post up a CREATE TABLE with INSERTS which can be runto create and populate a sample table, someone will show you the code.

^{“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw}

For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden