How to UPDATE one column using another column in another table? SQL Error: ORA-00933: SQL command not properly ended

Question

I have tried everything I can think of but couldn't solve this SQL error:

SQL Error: ORA-00933: SQL command not properly ended

This is Oracle SQL.

    UPDATE SALES_DATA_FAMILY_2007 A 
    SET A.POG_ID=B.POG_ID 
    FROM POG_HIERARCHY B 
    WHERE A.FAMILY_ID=B.FAMILY ;

One alternative I have tried is as below. Unfortunately it gives another error: ORA-01427: single-row subquery returns more than one row

    UPDATE SALES_DATA_FAMILY_2007 
    SET POG_ID= (SELECT POG_HIERARCHY.POG_ID FROM POG_HIERARCHY 
    WHERE SALES_DATA_FAMILY_2007.FAMILY_ID=POG_HIERARCHY.FAMILY_ID) 
    WHERE EXISTS (SELECT POG_HIERARCHY.POG_ID FROM POG_HIERARCHY 
    WHERE SALES_DATA_FAMILY_2007.FAMILY_ID=POG_HIERARCHY.FAMILY_ID) 
    ;

Please help!

Answer 1

If you want to update rows from a subquery with more than one record you can use the merge commenad:

merge into SALES_DATA_FAMILY_2007 A
using (select POG_ID , FAMILY
                 FROM POG_HIERARCHY ) B
on (A.FAMILY_ID=B.FAMILY)
when matched then
update set A.POG_ID=B.POG_ID