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IDS Forum

Case/When in SQL

Posted By: Long Nguyen
Date: Thursday, 3 April 2008, at 10:59 p.m.

Hi all,
I happened to see this beautiful SQL statement and executed with my IDS10
and got expected results (don't need to use temp tables as before :) ).
My request is where can I find online documentation for those sql
enhancements?
My appreciation,
Long Huy Nguyen
MIS(Analyst Programmer)
Ruralco Limited
P.O.Box 515
Wentworthville NSW 2145
(Ph) 02 9688 8528 (Fax) 02 9896 7763
lnguyen@ruralco.com.au
=================================================================================

"CURTIS CROWSON"

<curtis@crowson1. To: ids@iiug.org

com> cc:

Sent by: Subject: Re: help with correlated subquery [11726]

ids-bounces@iiug.

org

28/03/2008 06:04

AM

Please respond to

ids

This query I don't think is right based on your initial requirement that
both
values have to be not null. Let me give you an example:

create table test1 (col1 int, col2 char(4), amount int);
insert into test1 values (1,'dept',1);
insert into test1 values (1,'dept',2);
insert into test1 values (1,'dept',3);
insert into test1 values (1,'check',0);
insert into test1 values (1,'check',0);
insert into test1 values (1,'check',0);
insert into test1 values (1,'check',0);
insert into test1 values (1,'with',-1);
insert into test1 values (1,'with',-2);
insert into test1 values (1,'with',-3);

-- Your query returned -18 and 18 where it should return -6 and 6. So I
changed the query a little and actually was able to get it without a join.
SELECT
t.col1,
t.col2,
sum(Case when t.amount < 0

then t.amount else 0

END
) neg_sum,

sum(Case when t.amount > 0

then t.amount else 0

END) pos_sum
FROM
test1 t
WHERE
t.amount <> 0 and col2="dept"
group by
1,2
;

Now you shouldn't get any records if I understood your requirements because

there are no negative dept's but with your query you will get:

1 dept 0 6

The simplest way to do this with nine is to use my favorite whipping boy
views. If you have to do it inline then so be it but I would just create a
view:

It doesn't violate your requirements because you only do it on the server
side
one time and then use it on the reporting side. And if you are using a
limited
capability reporting tool like this views can open up a world of
possibilities
that you aren't able to imagine today.

create view my_sums(
col1,
col2,
neg_sum,
pos_sum
) as
SELECT
t.col1,
t.col2,
sum(Case when t.amount < 0

then t.amount

END
) neg_sum,

sum(Case when t.amount > 0

then t.amount

END) pos_sum
FROM
test1 t
WHERE
t.amount <> 0
group by
1,2
;

select
*
from
my_sums
where
col2 = "dept" and neg_sum is not null and pos_sum is not null
;

will give you the appropriate result which is empty because we didn't make
any
negative deposits.
*******************************************************************************

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Messages In This Thread

  • Case/When in SQL
    Long Nguyen -- Thursday, 3 April 2008, at 10:59 p.m.

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