I have a table with a large number of columns, which has data gathered from several other tables. I want to write some PL/SQL like:
DECLARE TYPE t_toptab_list IS TABLE OF toptab%ROWTYPE; l_data t_toptab_list; BEGIN SELECT ... -- many columns, with some manipulation, etc. BULK COLLECT INTO l_data FROM a,b,c,d WHERE ... -- join and filter, etc. -- EDIT: FORALL i IN 1..l_data.count INSERT INTO toptab VALUES l_data(i); END;
In order for the
BULK COLLECT to work properly, I have to list the columns in the
SELECT clause in exactly the same order as they are declared in the
toptab table. So the problem is that this code would be run in multiple environments. How do I either: (a) guarantee that all environments have the exact same column ordering, or (b) explicitly specify which columns go to which record elements but still use a bulk bind?
I understand that (a) could be done through strict schema management procedures. But let's say that's not an option here. In fact the different schemas may already have different column orderings. Can I reorder the columns without rebuilding the entire table? (Prohibitive.)
I know that (b) can be accomplished without the
BULK COLLECT by explicitly selecting into each record element, but I really want to do it in bulk.
Edit: I want to bulk insert into
toptab with the data I've collected. I separate these two steps because I need to batch the inserts into smaller transactions. (We use streams and find smaller transactions keep things moving smoother. However, batching each transaction is still much faster than doing N individual inserts.)