Finding column(s) with unique values

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Finding column(s) with unique values

Author

Topic

mageshks
Yak Posting Veteran

59 Posts

Posted - 2008-12-12 : 07:19:58

Hi all,
How to find the column(s) with unique values in a table

Thanks in advance

madhivanan
Premature Yak Congratulator

22864 Posts

Posted - 2008-12-12 : 08:02:51

Not sure what you want

SELECT DISTINCT column_name from table

Madhivanan

Failing to plan is Planning to fail

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2008-12-12 : 08:52:02

show some sample data and reqd output to illustrate what you mean by unique values

sakets_2000
Master Smack Fu Yak Hacker

1472 Posts

Posted - 2008-12-12 : 09:03:03

You can convert this to a sp and put parameters to your liking,

if exists(Select 1 from sysobjects where name ='tmp')
drop table tmp

declare @cnt int
set @cnt=0
declare @table varchar(100)
set @table='test'--put the name of the table here
declare @i int
set @i=1
declare @sql nvarchar(2000)
set @sql=''

select @cnt=count(*) from  syscolumns where [id]=object_id(@table)

select IDENTITY(int, 1,1) as a,'if not exists(select  ['+ name +'],count(*) from '+@table +' group by  ['+ name +'] having count(*)>1) select  '''+name+''''+'  ' as b  into tmp from  syscolumns where [id]=object_id(@table)


while (@i<=@cnt)
begin
	select @sql=@sql+b from tmp where a=@i
	set @i=@i+1
end

Exec (@sql)

sakets_2000
Master Smack Fu Yak Hacker

1472 Posts

Posted - 2008-12-12 : 09:08:07

Also, In the above, change the tmp table to a hash table.

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