Use of insert in case

Question

Hi,
Is it possible to use insert statement in CASE.
For example as follows:
let create a table as
create table DECOMPENSATED_BALANCE_TMP (ENDING_ENTERED_BALANCE_DR number, ENDING_ENTERED_BALANCE_CR number);
select
CASE
WHEN (PERIOD_NET_DR+BEGIN_BALANCE_DR-PERIOD_NET_CR-BEGIN_BALANCE_CR) total > 0
THEN
INSERT INTO XXGL_DECOMPENSATED_BALANCE_TMP (ENDING_ENTERED_BALANCE_DR) values (total)
WHEN (PERIOD_NET_DR+BEGIN_BALANCE_DR-PERIOD_NET_CR-BEGIN_BALANCE_CR) <= 0
THEN
INSERT INTO XXGL_DECOMPENSATED_BALANCE_TMP (ENDING_ENTERED_BALANCE_CR) values (total)
else
NULL
end
from gl_balances
where code_combination_id=109940 and currency_code='GBP';
Any answers will be highly appreciated ....
Thanks,
zaheer

Answer 1

I don't think that a conditional insert is really needed in this case. THe only part where the insert differse is the else part of your case statment where no insert should be done. THis can be made into a where clause.
An easy way would be to use a simple INSERT + SELECT statement. Where the value for the dr and cr columns are created by a case or a decode statement.
untested example
insert into XXGL_DECOMPENSATED_BALANCE_TMP
  (ENDING_ENTERED_BALANCE_DR, ENDING_ENTERED_BALANCE_CR)
select case WHEN (PERIOD_NET_DR+BEGIN_BALANCE_DR-PERIOD_NET_CR-BEGIN_BALANCE_CR) > 0  then total
          else null
          end as DR
         ,case WHEN (PERIOD_NET_DR+BEGIN_BALANCE_DR-PERIOD_NET_CR-BEGIN_BALANCE_CR) <= 0  then total
          else null
          end as CR
from gl_balances
where code_combination_id=109940
and currency_code='GBP'
and (PERIOD_NET_DR+BEGIN_BALANCE_DR-PERIOD_NET_CR-BEGIN_BALANCE_CR) is not null -- else part
;The good thing is you could run this insert statement for several code_combination_ids directly in SQL without any pL-loop.
Just noticed that leonard aready posted almost the same solution.
Edited by: Sven W. on Aug 24, 2011 3:22 PM