How to find duplicate image from SQL table with Image column

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Hi,

I have one new R&D task for my own project.

i have on table with column
auto_id (int identity), Catelog_Id (int) , CatelogImage (Image datatype)

and this table have around 20,000 rows in table.

now i want to find duplicate image from this table. than how is it possible? how can i do it? want to get auto_Id whose have same image in it.

--- What i have tried until now ---
Tried Distinct :
Error : The image data type cannot be selected as DISTINCT because it is not comparable.
Article : http://support.microsoft.com/kb/162032/en-us[^]

Tried by converting in to varbinary(max) and distinct:
not getting right solution because i thing varbinary datatype has limit like varchar(8000).

Please help if anybody have done this type of R&D.

Posted 29-Dec-14 20:12pm

desaihardikj@gmail.com

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BechirBenltaief · Answer 1 · 2014-12-30T02:23:00

Hi,

The main idea is to compare hash bytes with 'md5' algorithm.
I have create table like your columns

create table emp (auto_id int identity(1,1), Catelog_Id int, CatelogImage Image)

Next i have populate with script (running many times) :

SQL

Insert emp (Catelog_Id, CatelogImage)
Select 1001, BulkColumn from Openrowset( Bulk 'D:\CodeProject1.jpg', Single_Blob)
Insert emp (Catelog_Id, CatelogImage)
Select 1001, BulkColumn from Openrowset( Bulk 'D:\CodeProject2.jpg', Single_Blob)
Insert emp (Catelog_Id, CatelogImage)
Select 1001, BulkColumn from Openrowset( Bulk 'D:\CodeProject3.jpg', Single_Blob)

finally to list all id's for the same image, run this script :

;
with hashimage (
	hashimage_hash
	,hashimage_count
	)
as (
	select hashbytes('md5', cast([catelogimage] as varbinary)),count(*)
	from emp
	group by hashbytes('md5', cast([catelogimage] as varbinary))
	having count(*) > 1
	)
select hashimage_hash
	,stuff((
			select ',' + rtrim(auto_id)
			from emp sub
			where hashbytes('md5', cast([catelogimage] as varbinary)) = hashimage_hash
			for xml path('')
			), 1, 1, '')
from hashimage

Source :
https://social.msdn.microsoft.com/Forums/sqlserver/en-US/d55317cc-8bff-4e7d-a34c-f75da7e4778b/how-to-compare-imagevarbinary-column[^]