Re: Rows NOT found in cursor search

"better" in what way?

Db2 for i supports SQL statements of up to 2MB in size..

Either way the OP would end up with a list of static values passed to the
Db2, either in the single statement or in the insert into a temp table.

Inserting has overhead that the table value constructor method does not.

Charles

On Tue, Jul 14, 2020 at 3:07 PM Jose Perez <joseenocperez.jp@xxxxxxxxx>
wrote:

Hey Charles did you have a chance to read this
"and assume that it is a literal very large list of customer numbers, say
over 20,000" . Considering this your values will be toooooooooo long is
better to build
a table with all customers to search.

On Tue, Jul 14, 2020 at 4:56 PM Charles Wilt <charles.wilt@xxxxxxxxx>
wrote:

with selected_custs (customer_number) as
Values (123456789) , (234567890), (345678901)
)
select *
from selected_custs S
left outer join customer_master M
on M.customer_number = s.customer_number;

Note you're get two customer_number columns back, the second will be NULL
if the customer isn't found in customer_master

Charles




On Tue, Jul 14, 2020 at 1:48 PM Javier Sanchez <
javiersanchezbarquero@xxxxxxxxx> wrote:

Good day everyone.

I need to update a table whose key is a customer number, say a
NUMERIC(9,0).
I have to search with a cursor, for example like this:

EXEC SQL DECLARE CSR0001 CURSOR FOR
SELECT * FROM CUSTOMER_MASTER WHERE CUSTOMER_NUMBER IN (
123456789,
234567890,
345678901,....)

and assume that it is a literal very large list of customer numbers,

say

over 20,000.

I need to do a simple update of a column for some status for each found
row. But I need also to report which row was NOT found in this search

in

order to do some other task.

I suspect I should use a MERGE for this, but if I only use this cursor
approach, how does one know which rows are NOT found within the literal
list while the engine is searching?

Is there a kind of "exit" event to capture when the engine DOES NOT

find

a

matching row?

Thanks in advance.

JS
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