I tried 'concatenate' and join as following.
In the debug, script worked well, but Table C and D didn't join well.
It shows there is no data.
Please let's me know how I can join table to concatenated tables.
I could solve this problem by myself.
I changed the order to join or concatenate them.
1. join table C and table D
2.concatenate table B
It seems like joined tables read table b, so Join didn't work well.