Oracle rename columns from select automatically?

Question

I have 2 tables with the following fields.

Table1

• AA
• BB
• CC
• DD

Table2

• AA
• CC

Answer 1

Is creating a view an option?

What is the software you're using that does this to you? I don't see this behavior in SQL*Plus or PL/SQL Developer in 10g. PL/SQL won't let you build a cursor with this ambiguity in it.

Answer 2

Try this

 select t1.AA "t1_AA", t2.AA "t2.AA"
 from table1 t1,
 inner join table2 t2
 on table1.DD = table2.EE

As he said before, you need to do it per column

Answer 3

In Oracle SELECT syntax, there is currently no way to assign column aliases to multiple columns based on some expression. You have to assign an alias to each individual column.

Answer 4

Is there a magic way to do this in oracle?

Not that I'm aware of. Your options amount to:

1. Address the column naming scheme - you'd need to use ALTER TABLE statements like:

   ALTER TABLE table_name
        RENAME COLUMN old_name to new_name;
   

2. Use column aliases

You could use views to save on the work & effort of defining column aliases, but it's not a recommended practice because of the bad performance when layering views on top of one another.