Create History Table from Main

I'm seeking help from the experts because I'm far from an expert and I have been unsuccessful at figuring this out on my own.
So far I've created a history table which is to keep all our data history from our main table. It is almost the same table, but with a few added columns to better keep records. The purpose of creating the table is to keep from having so much data in our main table so it will cut down on data query times.
This, to me, is a very complicated SQL statement. I'm trying to use an INSERT statement to do this. But I'm updating the history table from multiple tables. An example of what I'm trying is:
INSERT INTO history_table a (column1, column2, column3, etc. )
SELECT (b.column1, b.column2, c.title||' '||c.l_name||', '||c.f_name, b.column4, etc.)
FROM main_table b, code_id_table c
WHERE b.column3 = c.column1
The problem is when I encounter null values in table3 c. Since I'm concatenating a few columns into one, if any of those columns are null, I get an error since it doesn't know what data to pull. I want it to just put NULL values where it's pulling NULL values. I'm pretty sure it will work with an IF THEN statement, but I'm not sure exactly how to handle it or if I'm even going at this with the right approach. The goal is the create a history table with a little more information than the main table so we have to pull information from multiple tables into the history table and get around the null values.
I hope I've made sense with any of this. If someone has some ideas, advice, or examples for me I'd greatly appreciate it. Thanks for your time.
-FC1

Oh I apologize. I'm running version 8i at the moment but will be upgrading to 10g within the next few weeks.
-FC1

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Please Mark This As Answer if it solved your issue
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