How do I get the same results in the Union vs join statement statement

Hello

I have 3 related tables and you must combine customers table1 and table3. My Control Panel is constantly evolving based schedule changes or order_completed qty. I have two problems that I can't solve.

Table 1: Manager has fields {managerId, Mangager_name, customerId & customer}
Table2: client includes the fields {customerId, orderId, product manager, managerId and}
Table 3: order has fields {orderId, customerId, customer, date, amount_order, qty, order_completed}

1. I need check what are customers or away from table Manager / order based on customerId and managerId

Here is the example of union that I would like to convert a join because I need to include aggregated order table fields and the customer at table eating based on the field of the client:

Select m.client
Manager m
where m.managerId = 22
Union select m.client in order o where o.customerId = 65

2. create a view or a temporary table (called State) to the report with an additional field that determines if the client has been found in the roll of the order and not in the table Manager.

Example of a view of the State or the temporary table select output
rownum. customer | status
1. Mary | The two Tables
2. Tomas | The two Tables
3. John | Customer table
4. April | Customer table

Thanks for the help

Hello

SQL> create table manager (m_id number, m_name char(10), customer_id number, client char(10));

Table created.

SQL>
SQL> insert into manager values (10,'M_1',111,'AAA');

1 row created.

SQL> insert into manager values (20,'M_2',222,'BBB');

1 row created.

SQL>
SQL> create table customer (C_id number, m_id number, order_id number);

Table created.

SQL>
SQL> insert into customer values (111,10,5000);

1 row created.

SQL> insert into customer values (222,20,5001);

1 row created.

SQL> insert into customer values (333,NULL,5002);

1 row created.

SQL> create table order_dt (Order_id number, c_id number, Client char(10));

Table created.

SQL> insert into order_dt values (5000,111,'AAA');

1 row created.

SQL> insert into order_dt  values (5002,333,'CCC');

1 row created.

SQL> select  rownum, a.c2, CASE WHEN ((a.ct2+a.ct1) = 2) THEN 'Both Tables'
  2         WHEN (a.ct2 = 1) THEN 'Client table'
  3         WHEN (a.ct1 = 1) THEN 'Manager table'
  4         ELSE 'NULL'
  5    END AS status
  6  from (
  7  select NVL(m.Client,o.Client) c2,count(m.Client) Ct1, count(O.Client) ct2
  8  from   manager m,
  9  customer c,
 10  order_dt O
 11  where m.m_id(+) = c.m_id
 12    and c.c_id = O.c_id(+)
 13  group by m.Client,O.Client
 14  ) A
 15  ;

    ROWNUM C2         STATUS
---------- ---------- -------------
         1 AAA        Both Tables
         2 CCC        Client table
         3 BBB        Manager table

-Pavan Kumar N

Tags: Database

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How do I get the same results in the Union vs join statement statement

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