ORACLE SQL Query with Parent and Child structure

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          PersonalThe 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

hi,
i hope this is what you want , this query matches all of your mentioned requirements .
WITH accounts AS
     (SELECT 3780952 AS customer_id, 3780952 AS account_id,
             3780952 AS parent_account_id
        FROM DUAL
      UNION ALL
      SELECT 3780997 AS customer_id, 3780997 AS account_id,
             3780997 AS parent_account_id
        FROM DUAL
      UNION ALL
      SELECT 3781004 AS customer_id, 3781004 AS account_id,
             3780997 AS parent_account_id
        FROM DUAL),
     customer AS
     (SELECT 3781004 AS customer_id, 'Personal' AS customer_group
        FROM DUAL
      UNION ALL
      SELECT 3780997 AS customer_id, 'Personal' AS customer_group
        FROM DUAL
      UNION ALL
      SELECT 3780952 AS customer_id, 'Personal' AS customer_group
        FROM DUAL)
SELECT customer_id, account_id, parent_account_id, "PS/NonPS",
       CASE
          WHEN "PS/NonPS" = 'NonPS'
             THEN NULL
          WHEN customer_id = parent_account_id
             THEN 'Y'
          WHEN customer_id <> parent_account_id
             THEN 'N'
       END principle,
       CASE
          WHEN "PS/NonPS" = 'NonPS'
             THEN NULL
          WHEN "PS/NonPS" = 'PS' AND customer_id <> parent_account_id
             THEN 'Y'
          WHEN "PS/NonPS" = 'PS' AND customer_id = parent_account_id
             THEN 'N'
       END SUM
  FROM (SELECT   t1.customer_id, t1.account_id, t1.parent_account_id,
                 CASE
                    WHEN t1.customer_id = t1.parent_account_id
                    AND (SELECT COUNT (*)
                           FROM accounts
                          WHERE parent_account_id = t1.parent_account_id) = 1
                       THEN 'NonPS'
                    ELSE 'PS'
                 END "PS/NonPS"
            FROM accounts t1, customer t2
           WHERE t1.customer_id = t2.customer_id
        ORDER BY t1.customer_id)
output
CUSTOMER_ID     ACCOUNT_ID     PARENT_ACCOUNT_ID     PS/NonPS     PRINCIPLE     SUM
3780952     3780952     3780952     NonPS          
3780997     3780997     3780997     PS     Y     N
3781004     3781004     3780997     PS     N     YThanks,
P Prakash
Edited by: prakash on Jan 17, 2012 3:38 AM