In a table have a column concatenate which contains duplicate values I need to update row_number to partition based on concatenate column

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Concatenate	                 concatenatecount	result
ABNS CONSTRUCTIONS BNREDDY NAGAR	        NULL	1
ABNS CONSTRUCTIONS BNREDDY NAGAR	        NULL	2
ABNS CONSTRUCTIONS BNREDDY NAGAR	        NULL	3
ACC LIMITED, MYSORE ROAD, BLR	            NULL	1
ACC LIMITED, MYSORE ROAD, BLR	            NULL	2
ASK ENTERPRISES	                            NULL	1
ASK ENTERPRISES	                            NULL	2
ASK ENTERPRISES	                            NULL	3
ASK ENTERPRISES	                            NULL	4

What I have tried:

Required output has been mentioned in result column , same need to be updated to concatenatecount column using sql query... pleas help me on the same

Posted 21-Apr-17 0:24am

Tryingtobeageek

Updated 21-Apr-17 3:13am

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CHill60 21-Apr-17 6:42am

The "What I have tried" section is for the code that you have tried and are having problems with.
Why are 'ABNS CONSTRUCTIONS BNREDDY NAGAR', 'ACC LIMITED, MYSORE ROAD, BLR' and 'ASK ENTERPRISES' all having result = 1?
Your question is not at all clear

Tryingtobeageek 21-Apr-17 7:33am

see duplicates are there in the column i need the partition ... to updated to concatenarecount column join concatenate column

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CHill60 · Answer 1 · 2017-04-21T03:12:00

The thing you are looking for is "Window Functions" - there is an article here - Window Functions in SQL Server - Simple Talk[^]

I created your data in a table like this

SQL

create table demo
(
	id int identity(1,1),
	[Concatenate]	 nvarchar(125),
	concatenatecount int,
	result int
)
insert into demo values
('ABNS CONSTRUCTIONS BNREDDY NAGAR',	NULL,	1),
('ABNS CONSTRUCTIONS BNREDDY NAGAR',	NULL,	2),
('ABNS CONSTRUCTIONS BNREDDY NAGAR',	NULL,	3),
('ACC LIMITED, MYSORE ROAD, BLR',	NULL,	1),
('ACC LIMITED, MYSORE ROAD, BLR',	NULL,	2),
('ASK ENTERPRISES',	                NULL,	1),
('ASK ENTERPRISES',	                NULL,	2),
('ASK ENTERPRISES',	                NULL,	3),
('ASK ENTERPRISES',	                NULL,	4)

With Window Functions you can specify how you want the data grouped using the OVER clause - in other words there is no need for a GROUP BY... Like this:

SQL

select id, [Concatenate], result,
		COUNT(*) OVER (PARTITION BY [Concatenate]), 
		ROW_NUMBER() OVER (PARTITION BY [Concatenate] ORDER BY [Concatenate])
from demo

And that gave me the output:

1	ABNS CONSTRUCTIONS BNREDDY NAGAR	1	3	1
2	ABNS CONSTRUCTIONS BNREDDY NAGAR	2	3	2
3	ABNS CONSTRUCTIONS BNREDDY NAGAR	3	3	3
4	ACC LIMITED, MYSORE ROAD, BLR		1	2	1
5	ACC LIMITED, MYSORE ROAD, BLR		2	2	2
6	ASK ENTERPRISES				1	4	1
7	ASK ENTERPRISES				2	4	2
8	ASK ENTERPRISES				3	4	3
9	ASK ENTERPRISES				4	4	4

I included "result" just to check the expected results - it's the last two columns that contain the information you need