Nested Merge ??

Question

I don't know where to begin to solve this issue.
I have a three tables:
<ul><li>Servers</li>
<li>Software </li>
<li>Software_Lookup</li>
</ul>
Servers.ID = serverlookup_id and Software.software_id = softwarelookup_id a
   IF NOT MATCHED THEN
      Servers.ID = serverlookup_id b
         IF MATCHED THEN
            update software_lookup set softwarelookup_id = (select software_id from software where software_name = 'Sysback' and software_version = '5.6.8.3')
               where (select "ID" from servers where host_name = 'ibm303')
         IF NOT MATCHED THEN
            insert (a.serverid_lookup,a.softwareid_lookup) values (b."ID",b.software_id);
      )if you can throw some keywords/concepts my way so I can start searching on the net and learning how to do this .. it would be greatly appreciated.

Answer 1

Okay .. I think I'm going to attempt a package instead
create or replace package software_pkg -- package spec
AS
     procedure checksoftware     (
     p_hostname varchar2,
     p_software varchar2,
         p_softwarename varchar2,
     p_checksoft number,
     p_checkhost number
     end software_pkg;
SHOW ERRORS
CREATE or REPLACE PACKAGE BODY softwarepkg AS -- package body
     procedure checksoftware     (
        p_hostname varchar2,
        p_software varchar2,
             p_softwarename varchar2,
        p_checksoft number,
        p_checkhost number
     end checksoftware;
IS
   BEGIN
     p_checksoft :=
        select SOFTWARELOOKUP_ID from software_lookup
           INNER JOIN software on software_id = SOFTWAREID_LOOKUP
        where software.software_name = :p_softwarename
        and software.software_version = :p_software
     p_checkhost :=
        select SOFTWARELOOKUP_ID from software_lookup
        INNER JOIN servers on "ID" = SERVERID_LOOKUP
        where servers.host_name = :p_hostname
       CASE
           WHEN      p_checkhost IS NULL
              THEN
             CASE     
                WHEN p_checksoft IS NULL
                   THEN
                     insert into software_lookup
                    (serverid_lookup,softwareid_lookup)
                       values
                       select "ID",software_id
                       from servers,software
                       where host_name = :p_hostname
                       and software_name = :p_softwarename
                       and software_version :p_software
               END CASE;
     END CASE;
END softwarepkg;  
SHOW ERRORS