How to select a column from all tables in which it resides?

Question

I have many tables that have the same column \'customer_number\'. I can get a list of all these table by query:

SELECT table_name FROM ALL_TAB_COLUMNS 
WHERE         


        

Answer 1

To get record from a table, you have write a query against that table. So, you can't get ALL the records from tables with specified field without a query against each one of these tables.

If there is a subset of columns that you are interested in and this subset is shared among all tables, you may use UNION/UNION ALL operation like this:

select * from (
select customer_number, phone, address from table1
union all
select customer_number, phone, address from table2
union all
select customer_number, phone, address from table3
)
where customer_number = 'my number'

Or, in simple case where you just want to know what tables have records about particular client

select * from (
select 'table1' src_tbl, customer_number from table1
union all
select 'table2', customer_number from table2
union all
select 'table3', customer_number from table3
)
where customer_number = 'my number'

Otherwise you have to query each table separatelly.