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get column name

Author

Topic

shanmugaraj
Posting Yak Master

219 Posts

Posted - 2013-04-17 : 07:23:44

I have 2 tables
I want to get the column name from table 1 where the column name is not present in table 2

ie :

SELECT SUBSTRING( (SELECT ',' + name FROM sys.columns where object_id = object_id('temp_main') FOR XML PATH('')),2,200000) AS CSV

--Result--
Name,dept_id,Salary

SELECT SUBSTRING( (SELECT ',' + name FROM sys.columns where object_id = object_id('temp_dynamic') FOR XML PATH('')),2,200000) AS CSV

--Result--
Name

Expected Query to return
dept_id, Salary

THANKS
SHANMUGARAJ
nshanmugaraj@gmail.com

shanmugaraj
Posting Yak Master

219 Posts

Posted - 2013-04-17 : 07:40:05

could you help me on this .. i am getting error as i am trying to return as string

SELECT ',' + namecol.name from
(
SELECT name FROM sys.columns where object_id = object_id('temp_main')
EXCEPT
SELECT name FROM sys.columns where object_id = object_id('temp_dynamic')
)
namecol FOR XML PATH('')),2,200000) AS CSV
other query i tryed is

SELECT SUBSTRING(',' +
(
(SELECT name FROM sys.columns where object_id = object_id('temp_main') )
except
(SELECT name FROM sys.columns where object_id = object_id('temp_dynamic') )
)
from Table1 FOR XML PATH('')),2,200000) AS CSV

THANKS
SHANMUGARAJ
nshanmugaraj@gmail.com

satheesh
Posting Yak Master

152 Posts

Posted - 2013-04-17 : 08:04:00

Try some thing like this,it will return unique column name.

SELECT COLUMN_NAME
FROM information_schema.columns
WHERE table_name = 'table 1' and COLUMN_NAME not in (SELECT COLUMN_NAME FROM information_schema.columns WHERE table_name = 'table 2')

Thanks

shanmugaraj
Posting Yak Master

219 Posts

Posted - 2013-04-17 : 08:08:48

Thanks Satheesh !

THANKS
SHANMUGARAJ
nshanmugaraj@gmail.com

bandi
Master Smack Fu Yak Hacker

2242 Posts

Posted - 2013-04-17 : 08:38:50

--See the below illustration


create table abc (col1 int, col2 char(2), col3 int)
create table abc2 (col2 int, col4 char(2))

DECLARE @csv1 VARCHAR(4000) = '', @csv2 VARCHAR(4000)=''
SELECT @csv1 = @csv1 +','+Column_name
FROM (Select COLUMN_NAME from INFORMATION_SCHEMA.COLUMNS where TABLE_NAME='abc' 
		Except
		Select COLUMN_NAME from INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME='abc2'
	)temp
	ORDER BY COLUMN_NAME DESC;
SELECT @csv2 = @csv2 +','+ Column_name
FROM (Select COLUMN_NAME from INFORMATION_SCHEMA.COLUMNS where TABLE_NAME='abc2' 
		Except
		Select COLUMN_NAME from INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME='abc'
	)temp1
	
SELECT @csv1, @csv2

--
Chandu

shanmugaraj
Posting Yak Master

219 Posts

Posted - 2013-04-17 : 09:55:42

Good one chandu. Thanks

THANKS
SHANMUGARAJ
nshanmugaraj@gmail.com

bandi
Master Smack Fu Yak Hacker

2242 Posts

Posted - 2013-04-18 : 02:35:50

quote:
Originally posted by shanmugaraj

Good one chandu. Thanks
THANKS
SHANMUGARAJ
nshanmugaraj@gmail.com

Welcome

--
Chandu

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2013-04-18 : 03:07:45

quote:
Originally posted by shanmugaraj

Good one chandu. Thanks

THANKS
SHANMUGARAJ
nshanmugaraj@gmail.com

Your initially posted solution using FOR XML should work fine and is much much efficient compared to variable concatenation method

------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/
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