Conditional SELECT from 2 tables

Hi, all
What it the best way to implement that logic in SELECT when I'll select record with unique REC-ID from t_good but it’s exist in other t_change with same REC-ID I’l need to select from there.
Something like IF EXIST, not sure how it works in Oracle. I see that I can JOIN all records from 2 table and check them later, but could be simpler way?
If record with REC-ID exist in t_change
Select * from t_change
else
Select * from t_ups_good Tx
Trent

Since we don't know the data structure and don't have examples we are somewhat limited in providing you options. Since we aren't sure how or where you are doing this we are further limited in offering suggestions. With that said my first thought is to use a Union All.
Select * from t_change where recid = [recid]
Union All
Select * from t_ups_good where (Select Count(1) From t_change where recid = [recid]) = 0

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Thank you for your reply.
I have tried
select value(t) from table t;
but it is still not working. I got almost the same answer as before.
Anyway thank you very much again.
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by MARCELO OCHOA ([email protected]):
Originally posted by meimei wu ([email protected]):
[b]I created a nested object-relational table using REF type in oracle8i. when I tried to select * from the table, I got lots of number as the ref type values, but actually, the value in ref type should be of type varchar2 and number. The number I got looked like following code:
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