How to update DB2 table with a join?

Question

I have two tables and I want to update by joining them. I am using DB2 V9.7.

ORDER_APPROVALS

ORDER_ID    CREATED_BY_ID   CREATED_BY         


        

Answer 1

update ORDER_ATTRIBUTE OT set OT.VALUE = 
(select CREATED_BY_NAME from ORDER_APPROVALS OA 
where OA.ORDER_ID = OT.ORDER_ID and OA.PROCESS_DT is NULL) 
where OT.ATTRIBUTE_ID = 123 

With this it's enough.