Question

I have 2 tables which are Account tbl and Customer tbl, the structure is like below:

Account tbl

Customer_ID    Account_ID    Parent_Account_ID    
3780952        3780952       3780952
3780997        3780997       3780997
3781004        3781004       3780997       

Customer tbl (Customer_Group have different value, but im only interest on Personal)

Customer_ID      Customer_Group
3781004          Personal
3780997          Personal
3780952          Personal      

The rule to determine PS/NonPS, Principle, Supp as per below:

**PS/NonPs**
Customer_ID equal to Parent_Account and Parent_Account is unique (not exist more than 1)  then NonPs.
Customer_ID equal to Parent_Account and Parent_Account is non unique OR -   Customer_ID is not equal to Parent_Account then PS    
**Principle** 
IF NonPS then Principle is Null
IF PS - If Customer_ID equal to Parent_Account then Principle is Y else N
**Supp**
IF NonPS then Supp is Null
IF PS - If Customer_ID not equal to Parent_Account then supp is Y else N

The final output should be like this

Customer_ID    Account_ID    Parent_Account_ID   PS/NonPS   Principle   Supp
3780952        3780952       3780952             NonPS       Null        Null
3780997        3780997       3780997             PS          Y           N
3781004        3781004       3780997             PS          N           Y   

I alredy tried many times but still cant get the output..anyone can help ?

Answer 1

With CASE and analytic functions:

SQL> WITH myData AS (
  2    SELECT 3780952 Customer_ID, 3780952 Account_ID, 3780952 Parent_Account_ID
  3      FROM DUAL
  4    UNION ALL SELECT 3780997, 3780997, 3780997 FROM DUAL
  5    UNION ALL SELECT 3781004, 3781004, 3780997 FROM DUAL
  6  )
  7  SELECT v.*,
  8         CASE WHEN ps = 'PS' AND customer_id = parent_account_id  THEN 'Y'
  9              WHEN ps = 'PS' THEN 'N'
 10         END "Principle",
 11         CASE WHEN ps = 'PS' AND customer_id != parent_account_id  THEN 'Y'
 12              WHEN ps = 'PS' THEN 'N'
 13         END "Supp"
 14    FROM (SELECT m.*,
 15                 CASE WHEN customer_id = parent_account_id
 16                       AND COUNT(*) OVER (PARTITION BY parent_account_id) = 1
 17                      THEN 'NonPS'
 18                      ELSE 'PS'
 19                 END ps
 20            FROM myData m) v;

CUSTOMER_ID ACCOUNT_ID PARENT_ACCOUNT_ID PS    P S
----------- ---------- ----------------- ----- - -
    3780952    3780952           3780952 NonPS
    3781004    3781004           3780997 PS    N Y
    3780997    3780997           3780997 PS    Y N