Rank in dynamic query in SQL - sql

Question

I am trying to build a dynamic query and create a ranking base on one of the columns
this is the code I have so far
/*Declare Variable*/
DECLARE #DynamicPivotQuery AS NVARCHAR(MAX),
#PivotColumnNames AS NVARCHAR(MAX),
#PivotSelectColumnNames AS NVARCHAR(MAX),
#Week_Value AS NVARCHAR(MAX),
#Rank AS NVARCHAR(MAX)
--Get distinct values of the PIVOT Column
SELECT #PivotColumnNames= ISNULL(#PivotColumnNames + ',','')+ QUOTENAME([W])
FROM (SELECT DISTINCT [W] FROM [Server].[dbo].[Table]) AS cat
ORDER BY [W]
--Get distinct values of the PIVOT Column with isnull
SELECT #PivotSelectColumnNames = ISNULL(#PivotSelectColumnNames + ',','')+ 'ISNULL(' + QUOTENAME([W]) + ', 0) AS '+ QUOTENAME([W])
FROM (SELECT DISTINCT [W] FROM [Server].[dbo].[Table]) AS cat
ORDER BY [W]
--Get current week value
SET #Week_Value = SUBSTRING(#PivotColumnNames,81,15)
--PRINT #Week_Value --Make sure value is correct
--Get the ranking for previews week
SET #Rank = 0 -- this initialize the rank
--Prepare the PIVOT query using the dynamic
SET #DynamicPivotQuery = '
SELECT TOP 200 [L], [Doc_ID], '+#PivotSelectColumnNames+','+#Rank+' AS RNK
FROM
(SELECT [L],
[Doc_ID],
[W],
ISNULL(CAST([PV] AS INT),0) AS [Page_Views]
FROM [Server].[dbo].[Table]
WHERE LEN([Doc_ID]) = 8 OR LEN([Doc_ID]) = 9)Tab1
PIVOT
(
SUM([Page_Views])
FOR [Week] IN ('+#PivotColumnNames+')
) AS Tab2
ORDER BY '+#Week_Value+' DESC'
--Execute the Dynamic Pivot Query
EXEC sp_executesql #DynamicPivotQuery
so the problem is that the rank is static and I can't figure out how to sum +1 in each row, the rank has to be set base on #PivotColumnNames order, this is a sample from the data I have so far applying the code above
L
Doc_ID
Week 12, 2021
Week 13, 2021
Week 14, 2021
Week 15, 2021
RNK
en
c03722645m
191867
168145
188472
185189
0
fr
c03746609
55908
53467
56678
56028
0
this is what I would like
L
Doc_ID
Week 12, 2021
Week 13, 2021
Week 14, 2021
Week 15, 2021
RNK
en
c03722645m
191867
168145
188472
185189
1
fr
c03746609
55908
53467
56678
56028
2
any help or recommendation would be appreciated

Answer 1

Hi There are multiple Ranking options available in TSQL. The question that you have you have to determine the required ranking function as per your requirement. I will use RANK() function in this periocular solution
/*Declare Variable*/
DECLARE #DynamicPivotQuery AS NVARCHAR(MAX),
#PivotColumnNames AS NVARCHAR(MAX),
#PivotSelectColumnNames AS NVARCHAR(MAX),
#RankingSelectColumn AS VARCHAR(MAX), --Create ranking statement (Added)
#Week_Value AS NVARCHAR(MAX),
#Rank AS NVARCHAR(MAX)
--Get distinct values of the PIVOT Column
SELECT #PivotColumnNames= ISNULL(#PivotColumnNames + ',','')+ QUOTENAME([W])
FROM (SELECT DISTINCT [W] FROM [Server].[dbo].[Table]) AS cat
ORDER BY [W]
--Make Ranking logic depending on the rank change ASC or DESC
SELECT #RankingSelectColumn = ISNULL(#RankingSelectColumn + ' ASC,','')+ 'ISNULL(' + QUOTENAME([W]) + ', 0) AS '+ QUOTENAME([W])
FROM (SELECT DISTINCT [W] FROM [Server].[dbo].[Table]) AS cat
ORDER BY [W]
--Get distinct values of the PIVOT Column with isnull (Added)
SELECT #PivotSelectColumnNames = ISNULL(#PivotSelectColumnNames + ',','')+ 'ISNULL(' + QUOTENAME([W]) + ', 0) AS '+ QUOTENAME([W])
FROM (SELECT DISTINCT [W] FROM [Server].[dbo].[Table]) AS cat
ORDER BY [W]
--Get current week value
SET #Week_Value = SUBSTRING(#PivotColumnNames,81,15)
--PRINT #Week_Value --Make sure value is correct
--Get the ranking for previews week
SET #Rank = 0 -- this initialize the rank
--Prepare the PIVOT query using the dynamic (Added Rank function)
SET #DynamicPivotQuery = '
SELECT TOP 200 [L], [Doc_ID], '+#PivotSelectColumnNames+',RANK() OVER('+#RankingSelectColumn+') AS RNK
FROM
(SELECT [L],
[Doc_ID],
[W],
ISNULL(CAST([PV] AS INT),0) AS [Page_Views]
FROM [Server].[dbo].[Table]
WHERE LEN([Doc_ID]) = 8 OR LEN([Doc_ID]) = 9)Tab1
PIVOT
(
SUM([Page_Views])
FOR [Week] IN ('+#PivotColumnNames+')
) AS Tab2
ORDER BY '+#Week_Value+' DESC'
--Execute the Dynamic Pivot Query
EXEC sp_executesql #DynamicPivotQuery
This will rank according to the column logic