Hi guys,
I have two tables that supports the same data, but different table DDL (We are migrating all the data from one to another).
What I need is basically:
1. Query looks for the data on table A,
2. if it doesn't find it on table A, go look for it on table B
Now, how could I do that in a Select? Can you please provide some examples?
I'm using PostgreSQL 9.1.
Thanks
Patrick
