How to use one query against multiple table and recieve one report?

Question

I have duplicate tables, (except for their names of course) with commodities prices. They have the same column headings, but the data is different of course. I have a query that gives me a certain piece of information I am looking for but now I need to run this query against every table. I will do this every day as well, to see if the buying criteria is met. There are alot of tables though (256). Is there a way to say run query in all tables and return the results in one place? Thanks for your help.

Answer 1

hey
a. the all 256 tables whuld be one big partitoned table
b. you can use all_tables in order to write a select that will write the report for you:
SQL> set head off
SQL> select 'select * from (' from dual
  2  union all
  3  select 'select count(*) from ' || table_name || ' union all ' from a
  4  where table_name like 'DB%' AND ROWNUM <= 3
  5  union all
  6  select ')' from dual;
select * from (
select count(*) from DBMS_LOCK_ALLOCATED union all
select count(*) from DBMS_ALERT_INFO union all
select count(*) from DBMS_UPG_LOG$ union all
remove the last 'union all', and tun the generated quary -
SQL> set head on
SQL> select * from (
  2  select count(*) from DBMS_LOCK_ALLOCATED union all
  3  select count(*) from DBMS_ALERT_INFO union all
  4  select count(*) from DBMS_UPG_LOG$
  5  );
  COUNT(*)
         0
         0
         0
Amiel