What is the Final Table equivalent for Merge?

Question

I\'m trying to use merge into to insert only new records. I would like to collect the IDs for new records that got inserted and also the IDs for duplicate records that get igno

Answer 1

Something like this will run on Db2 LUW (assuming you are using ORGANIZE BY ROW tables).

with s (val_col_1, val_col_2) AS  (values 
            (231, 'Value 1'),
            (481, 'Value 2'),
            (513, 'Value 4')
        )
, i as (select * from final table(
    INSERT INTO ssz_me_mis.test_update_table ( val_col_1 , val_col_2) 
     select * from s where not exists (select 1 from ssz_me_mis.test_update_table t
        where 
        t.val_col_1 = s.val_col_1
        and t.val_col_2 = s.val_col_2
        )
))
, u as (select count(*) as dummy from new table(
    update ssz_me_mis.test_update_table t
    set val_col_1 = (select val_col_1 from s where t.val_col_1 = s.val_col_1 and t.val_col_2 = s.val_col_2)
    ,   val_col_2 = (select val_col_2 from s where t.val_col_1 = s.val_col_1 and t.val_col_2 = s.val_col_2)
    where exists    (select val_col_2 from s where t.val_col_1 = s.val_col_1 and t.val_col_2 = s.val_col_2)
))
select ID_col from i, u

I included a branch for updates, but logically you need some non-key columns for that to make sense. Your example is just an INSERT in practice, so I was a bit confused why you were using MERGE at all.