Creating tables with fields from 2 different table

问题:

I want to create a table that stores values from two different tables;

From table 1: cust_id (varchar2), invoice_amt (float)

From table 2: cust_id (from table 1), payment_date

My table should have 3 fields:

cust_id, invoice_amt, payment_date

I tried the following, which is obviously wrong.

create table temp1 as (
    select table_1.cust_id, table_1.invoice_amt, table_2.payment_date
      from table_1@dblink, table_2@dblink)

Your valuable suggestions will be of great help.

回答1:

create table temp1 as (
    select 
        table_1.cust_id,
        table_1.invoice_amt,
        table_2.payment_date 
    from 
        table_1@dblink, 
        table_2@dblink 
    where 
        table_1.cust_id = table_2.cust_id
    )

I'm no oracle guy, but that should do what you want (untested, though).

回答2:

You were close:

create table temp1 as ( 
    select t1.cust_id, t1.invoice_amt, t2.payment_date 
      from table_1@dblink t1, table_2@dblink t2 
     where t1.cust_id=t2.cust_id)

回答3:

It depends on what you're going to use it for, but I'd be sorely tempted to use a view instead of a table:

create view temp1(cust_id, invoice_amt, payment_date) as
    select t1.cust_id, t1.invoice_amt, t2.payment_date 
      from table_1@dblink as t1 inner join table_2@dblink as t2
           on t1.cust_id = t2.cust_id

The advantage is it always contains the values from the current versions of table_1 and table_2. The disadvantage is that you cannot edit the view (or, if you can, your edits affect the underlying tables as well as the view).