Ioana Danes wrote
> Hi All,
> Is there any similar syntax that only invokes the procedure once and
> returns all the columns?
Generic, adapt to fit your needs.
WITH func_call AS (
SELECT function_call(...) AS func_out_col
)
SELECT (func_out_col).*
FROM func_call;
Basically you have to execute the function call and leave the result as a
single column (a row type). Then, in another layer of the query, you expand
that single column into its components using "*". Because you are expanding
a column and not a table you must put the column name in "()" - otherwise
the parser thinks "func_out_col" is a table and errors out.
This all definitely applies to 9.2 and earlier. 9.3 (with lateral) may
behave differently...
David J.
Hi David,
Thank you for your reply, I haven't thought about it. This works as expected if I don't need to filter the table
tmp_Cashdrawer:
select tmp_Cashdrawer.CashdrawerID,
(test1(tmp_Cashdrawer.CashdrawerID)).* from tmp_Cashdrawer where
tmp_Cashdrawer.CashdrawerID in (1);
If I will have to filter the tmp_Cashdrawer table then it executes the function for the all the cash drawers and then
filterout the result which again is not efficient...
I might use an aggregate table for this. This way I can use a simple function call to update the aggregate table when a
cashdrawer is balanced or before executing the report.
Thanks again for your reply,
Ioana