SQL update from one Table to another based on a ID match IN db2

Question

The Query below is suited in SQL sErver. But in DB2 it does not give results:

Error is  SQLCODE = -199, ERROR:  ILLEGAL USE OF KEYWORD FROM. 

Answer 1

response to your question

UPDATE Sales_Import f1
SET f1.AccountNumber = 
(
 SELECT f2.AccountNumber
 FROM RetrieveAccountNumber f2
 WHERE f1.LeadID = f2.LeadID
 FETCH FIRST ROW ONLY
)
WHERE exists
(
SELECT * FROM RetrieveAccountNumber f2
 WHERE f1.LeadID = f2.LeadID 
)

template methode

update table1 f1
set (f1.field1, f1.field2, f1.field3, f1.field4)=
(
select f2.field1, f2.field2, f2.field3, 'CONSTVALUE'
from table2 f2
where (f1.key1, f1.key2)=(f2.key1, f2.key2) 
)
where exists 
(
select * from table2 f2
where (f1.key1, f1.key2)=(f2.key1, f2.key2)
)