Oracle Update Query using Join

Question

I am trying to update the amount using Join but getting exception:

UPDATE tab1
   SET tab1.total_adjusted_cost = tab1.total_adjusted_cost + t1.total
 FROM ta         


        

Answer 1

I think you have to use select keyword also. And follow the ANSI standard.

UPDATE tab1 
    SET tab1.total_adjusted_cost = (select tab1.total_adjusted_cost + t1.total
                                   FROM table1 tab1, 
                                  (SELECT tab3.name, tab3."add", SUM(tab2.amount) AS total
                                  FROM table2 tab2 JOIN  table3 tab3 
                                                    ON tab2.id   = tab3.id
                                                   JOIN  table4 tab4 
                                                    ON  tab3.id  = tab4.id
                                   WHERE tab4.indicator ='Y'
                                   GROUP BY tab3.name,tab3."add") t1
    WHERE tab1.id = t1.id);