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remove null column in SQL

Posted on 2011-02-11
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Last Modified: 2012-06-21
Is it possible removed any columns that is null?
sample select *from table1
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Question by:VBdotnet2005
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11 Comments
 
LVL 3

Expert Comment

by:sunezapa
ID: 34876425
remove rows by Select * from table1 where column is not null
and
show nulls as something else by Select ISNULL(column,'') from...

but what do you exactly means with "Remove Columns"?
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Author Comment

by:VBdotnet2005
ID: 34876583
let's say it a result has any column that is null, I want to be able to remove it from the result
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Author Comment

by:VBdotnet2005
ID: 34876589
select field1, field2, field3 from tabl1

result

john      doe      null
jim      doe      null
james      doe      null
            

I dont want to get null column

Just this

john      doe       
jim      doe       
james      doe       

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LVL 75

Expert Comment

by:Anthony Perkins
ID: 34876592
SELECT *
FROM YourTableNameGoesHere
WHERE YourColumnNameGoesHere IS NOT NULL
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LVL 75

Expert Comment

by:Anthony Perkins
ID: 34876595
Ah, that is different.  You will have to handle that in your front-end.
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LVL 3

Expert Comment

by:sunezapa
ID: 34876618
try the ISNULL thing...
Select  field1, field2, ISNULL(field3,'') from table1

Open in new window

it will not return any NULL values (in example an empty string is returned instead)...
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LVL 41

Expert Comment

by:Sharath
ID: 34876986
If your result is

john      doe      null
jim      doe      null
james      doe      abc

What would be your expected result?
           
0
 

Author Comment

by:VBdotnet2005
ID: 34879362
Above three columns
If the entire column are null,I want to remove it
If partials, leave it alone
0
 
LVL 3

Expert Comment

by:sunezapa
ID: 34879566
no SQL code can know what "the next records" will be, so it is not possible to decide to bring a column or not at runtime.
Do the "filtering" in your frontend.
Maybe ask more detailed what the purpose is - there may be easy solutions, other than what you describe...
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LVL 75

Accepted Solution

by:
Anthony Perkins earned 500 total points
ID: 34879599
If you are unable to solve this in the front-end (though why you would even consider doing this is beyond me) and are adamant to do it with T-SQL alone then consider something like this:
IF EXISTS (
	SELECT 1
	FROM dbo.YourTable
	WHERE YourColumn IS NOT NULL)
	SELECT Col1, Col2, YourColumn 
	FROM dbo.YourTable
ELSE
	SELECT Col1, Col2 
	FROM dbo.YourTable

Open in new window

0
 
LVL 41

Expert Comment

by:Sharath
ID: 34880384
What is your SQL Server version?
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