Comments on: SQL CASE statement with NULLs

By: Ici

Ici — Thu, 20 Sep 2012 11:44:44 +0000

Many thanks

By: James

James — Mon, 30 Apr 2012 02:21:21 +0000

The problem with sub selects is that they tend to slow everything down when working with large data sets. I am currently having trouble with this where the nulls will be sorted out properly if I put the statement in the where clause but I cannot change the value via a case statement in the select clause using all the methods mentioned above and then some.

By: Phil

Phil — Wed, 01 Feb 2012 10:14:03 +0000

Thanks for this, I was having trouble with NULL values but the ‘search’ method of the CASE statement works just fine.

By: Usman

Usman — Wed, 02 Nov 2011 16:45:27 +0000

Thanks Buddy. Helped me to get those NULL variables to accept values! My blog on that here:
http://usman-suglatwala.blogspot.com/2011/11/handling-nulls-in-sql-while-inserting.html

By: Priya

Priya — Mon, 31 Jan 2011 12:11:31 +0000

Hi Stelban and Kumar,
@ Kumar : Actually, I was in need of not null records.

I have resolved the issue in a simple way by just putting my query in a new select statement.

select * from (Select NAME, EMPID,
case
when ( LOCATION like 'chennai' or LOCATION like 'coimbatore')
then 'Tamil Nadu'
when ( LOCATION like 'cochin' or LOCATION like 'Trivandrum')
then 'Kerala'
else
end STATE
from biodata where EMPID in ( select EMPID from biodata))
where STATE is not null;

This gives the o/p
NAME    EMPID    STATE
Tom    12546    Tamil Nadu
Amy    14645    Kerala
rather than

The output would be like,

NAME    EMPID    STATE
Tom    12546    Tamil Nadu
Amy    14645    Kerala
Katie    24645
Ravesh    54654

Hope this helps !!

By: kumar

kumar — Wed, 22 Dec 2010 15:52:33 +0000

use ISNULL(columnName,)

Hope this helps…

By: stelban

stelban — Fri, 29 Oct 2010 17:46:29 +0000

Nice trick using nulls with case statement. Very helpful! Thanks

By: Priya

Priya — Tue, 07 Sep 2010 13:51:08 +0000

The output would be like,

NAME    EMPID    STATE
Tom    12546    Tamil Nadu
Amy    14645    Kerala
Katie    24645
Ravesh    54654

I need only not null state records.Please do the needful. Iam facing the issue in my project

By: Priya

Priya — Tue, 07 Sep 2010 12:55:56 +0000

I have a similar issue. I do not wanna display the NULL records hitting the
else part.For eg .I tried out methods like

Select NAME, EMPID,
case
when ( LOCATION like 'chennai' or LOCATION like 'coimbatore')
then 'Tamil Nadu'
when ( LOCATION like 'cochin' or LOCATION like 'Trivandrum')
then 'Kerala'
else
end STATE
from biodata where EMPID in ( select EMPID from biodata)
and STATE is not null;

But iam getting displayed with null STATE records. Please help.

By: Patel Pinakin

Patel Pinakin — Sat, 03 Apr 2010 07:08:22 +0000

was just forgot the syntax,
thanx
u helped me recall…

keep posting…