how to select the value from sub query result

问题

I have the following 4 tables mentioned below and trying to extract the value ACC_NUMBER from sub query, Please help me with optimized correct syntax

ACCOUNT TABLE
-------------------------
|ACC_NUMBER  |  ACC_NAME|
-------------------------

ACCOUNT_DETAILS TABLE
---------------------------------
|ACC_NUMBER |DEAL_NUMBER|DEAL_TYPE|
---------------------------------

DEALS TABLE
------------------------------------
|DEAL_NUMBER |DEAL_TYPE|DEP_NUMBER |
------------------------------------

DEPARTMENT TABLE
------------------------
|DEP_NUMBER  | DEP_NAME |
------------------------

SELECT 
D.DEAL_NUMBER,
D.D_TYPE,
DP.DEPARTMENT_NUMBER 
FROM 
DEALS D , DEPARTMENT DP
WHERE 
D.DEP_NUMBER = DP.DEP_NUMBER
AND D.DEAL_NUMBER NOT IN
                 (SELECT ACD.DEAL_NUMBER
                    FROM ACCOUNT_DETAILS ACD, ACCOUNT AC
                   WHERE AC.ACC_NUMBER = ACD.ACC_NUMBER
                        AND DEAL_TYPE = 'XXXX'
                         AND ACD.DEAL_NUMBER = D.DEAL_NUMBER)

回答1:

Hi, If you are using D.DEAL_NUMBER NOT IN that means that records join is not present in ACCOUNT and ACCOUNT_DETAILS table, You will never get ACC_NUMBER for that particular deals?

If you are ready to do some alteration in the current syntax, You can play with joins to get ACC_NUMBER in your query result:

Example:

SELECT 
D.DEAL_NUMBER,
D.D_TYPE,
ACD.ACC_NUMBER,
DP.DEPARTMENT_NUMBER 
FROM 
DEALS D 
join DEPARTMENT DP
on D.DEP_NUMBER = DP.DEP_NUMBER
left join ACCOUNT_DETAILS ACD
on ACD.DEAL_NUMBER = D.DEAL_NUMBER
join ACCOUNT AC AC.ACC_NUMBER = ACD.ACC_NUMBER
WHERE DEAL_TYPE = 'XXXX'
             AND ACD.DEAL_NUMBER = D.DEAL_NUMBER

来源：https://stackoverflow.com/questions/45369874/how-to-select-the-value-from-sub-query-result

标签

sql

Oracle

subquery