What are the basic steps to manually code an MRU with a 3 column PK?

Greetings
Let me try this another way.
Newbie here trying to create a test application that will perform a multi-row update of a table with a 3-column primary key.
I understand I can't use the built-in MRU processes since it appears they will only accept up to two (2) columns for a PK.
I don't have the ability to change the table constraints.
I am able to create the SQL report using my search criteria but I can't seem to figure out the connection between the user clicking on my 'Apply Changes' button and making the rows they've modified get committed to the database.
Any remedial guidance is greatly appreciated.
-gary

gwicke ,
 Your solution with concatenated value in one field as PK is woerse solution then my suggestion.
 1) Field is bigger then on PK with INTEGER based sequence. On large tables it may have some impact...and after all this is VARCHAR PK
 2) VARCHAR PK are several time slover in comparing then INTEGER like PK!
 3) Unique index (in my case) will be used when you query your data In a case of F1, F2 and F3 fields which are representing yours PK when you say
 
 WHERE value1=f1 and value2=f2 or
 ORDER BY F1, F2 oracle will know to use UQ index very efficiently and retrive data allmost as fast as possible.... on large tables or many concurent users this will have enormous impact on app performance!
 In your case, to get the same functionality as mentioned above, you should use "function index" (available only in EE versions of Oracle) or "INSTR, "SUBSTR" or "LIKE" or some other interesting string functions to compare value (regarding concatenated PK you've mentioned) with your PK.
 So I'm still standing on my first post and for me this thread is closed!
 P.S.
 With this post I think that we have cleared out one issue and you may find some other interesting question about database design and performance question opened. Many developers do not care for that...so sometimes apps crawle like dying cats....
Message was edited by:
[email protected]

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