How to use the result of SQL aggregate in IF statement - sap

Question

I am trying to script a procedure in HANA, and I have a requirement to compare the Week ID's of 2 tables. If the Week ID1 > Week ID2, I have to insert the new records to table which has ID2. I tried the below logic, but that did not work.
Here, the logic inside the IF is not executing, though the
VAR1 VARCHAR(2);
VAR2 VARCHAR(2);
BEGIN
SELECT MAX(FISCAL_WK) AS VAR1 FROM "XXX"."OUTLOOK_FACTS";
SELECT MAX(FISCAL_WK) AS VAR2 FROM "XXX"."OUTLOOK";
IF :VAR2 > :VAR1 THEN
SELECT MAX(OUTLOOKID) AS TEST FROM "XXX"."OUTLOOK_FACTS";
END IF;
END;
I am pretty new to this, so please help.

Answer 1

In your code example you don't actually assign values to :VAR1 or :VAR2, so both variables stay empty.
Try with
SELECT MAX(FISCAL_WK) AS VAR1 into :VAR1 FROM "XXX"."OUTLOOK_FACTS";
SELECT MAX(FISCAL_WK) AS VAR2 into :VAR2 FROM "XXX"."OUTLOOK";
IF :VAR2 > :VAR1 THEN
SELECT MAX(OUTLOOKID) AS TEST FROM "XXX"."OUTLOOK_FACTS";
END IF;
You could, however also just pack everything in a single SQL statement. But that's for you do choose :)

Answer 2

For that insert you don't need any procedural code.
You could do it in straight SQL:
select case
when max_fisc > max_fisc_fact then
max_id_fact
else
-1
end as VALUE_TO_BE_INSERTED
from (
select max(o.fiscal_wk) as max_fisc, max(o.outlookid) as max_id
, max(f.fiscal_wk) as max_fisc_fact, max(f.outlookid) as max_id_fact
from outlook o
cross join outlook_facts f);
Just pack this SQL into your INSERT statement and you're done.
- Lars