Update with a select statement

Question

hi experts,
I need some help again.. :)
I have an insert query here with a select statement.. Juz wondering how to do it in update?
insert into newsmail_recipient
        (IP_RECIPIENTID,NF_LISTID,NF_STATUSID,D_CREATED,D_MODIFIED,C_NAME,C_EMAIL,USER_ID,NEWSMAIL_ID)
        select newsmail_recipientid_seq.nextval
          , liste
          , 1
          , sysdate
          , sysdate
          , null
          , null
          , ru.nf_userid
          , null
        from roleuser ru, unit u, userinfo ui
        where u.ip_unitid = ru.nf_unitid
        and u.ip_unitid = unit_id
        and ui.ip_userid = ru.nf_userid
        and ui.nf_statusid = 1
        and n_internal = 0
        and ui.ip_userid not in (select user_id
                                   from newsmail_recipient
                                  where user_id = ui.ip_userid
                                    and nf_listid = liste
                                    and nf_statusid = 1);let me know your thoughts.
Regards,
jp

Answer 1

Hi,
924864 wrote:
... I have an insert query here with a select statement.. Juz wondering how to do it in update?How to do what, exactly?
MERGE can UPDATE existing rows, and INSERT new rows at the same time. In a MERGE statement, you give a table or a sub-query in the USING clause, and define how rows from that result set match rows in your destination table. If rows match, then you can UPDATE the matching row with values from the sub-query.
Very often, MERGE is easier to use, and perhaps more efficient, than UPDATE just for changing existing rows. That is, while MERGE can do both INSERT and UPDATE, it doesn't have to . You can tell MERGE just to do one or the other if you wish.
I hope this answers your question.
If not, post a little sample data (CREATE TABLE and INSERT statements, relevant columns only) for all tables involved, and also post the results you want from that data.
Since you're asking about a DML statement, such as UPDATE, the sample data will be the contents of the table(s) before the DML, and the results will be state of the changed table(s) when everything is finished.
Explain, using specific examples, how you get those results from that data.
Always say which version of Oracle you're using (e.g., 11.2.0.2.0).
See the forum FAQ {message:id=9360002}