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Query to compare 2 values of 1 column based on where clause

 
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Poha Eater

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Joined: 31 Aug 2016
Posts: 45
Location: India

PostPosted: Fri Mar 09, 2018 10:45 am    Post subject: Query to compare 2 values of 1 column based on where clause
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Hi All,

There is a table called ROLES which is having 3 fields : MASTER_ID, ROLE_CODE & DIRECTORY_ID. For each MASTER-ID there are 3 values of ROLE_CODE (the values are 'OWN','PAY' & 'INS') and for each value of ROLE_CODE there is one DIRECTORY-ID. This DIRECTORY-ID can either be same or different.

Ex : -

Code:

MASTER_ID        ROLE_CODE         DIRECTORY_ID
-------------        --------------        ------------------
123456                  OWN                ABCDEF
123456                  PAY                  GHIJKL
123456                  INS                  ABCDEF
789012                  OWN                MNOPQR
789012                  PAY                  MNOPQR
789012                  INS                  MNOPQR


I want to fetch those MASTER_ID which is not having the same DIRECTORY_ID in ROLE_CODE 'OWN' & 'PAY'.

Code:

Expected Output :

MASTER_ID        ROLE_CODE         DIRECTORY_ID
-------------        --------------        ------------------
123456                  OWN                ABCDEF
123456                  PAY                  GHIJKL


Is it possible to write sql query for this. If yes, Please tell me how can we write this because when i trying to write it i am not getting from where i can start as i am a beginner in DB2 Querying and i have never written any query for scenario like this, so not getting from where i can start.


Many Thanks !
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Poha Eater

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Joined: 31 Aug 2016
Posts: 45
Location: India

PostPosted: Fri Mar 09, 2018 11:15 am    Post subject:
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Hi,

This is the query which is i am trying, not sure even if it will work

Code:
SELECT MASTER_ID,DIRECTORY_ID,ROLE_CODE FROM VACYONR1.ROLES   
WHERE ROLE_CODE IN ('OWN','PAY')                             
GROUP BY DIRECTORY_ID HAVING COUNT(DIRECTORY_ID)>1           



and this is the output i am getting

Code:

DSNT408I SQLCODE = -122, ERROR:  COLUMN OR EXPRESSION IN THE SELECT LIST IS NOT
         VALID                                                                 
DSNT418I SQLSTATE   = 42803 SQLSTATE RETURN CODE                               
DSNT415I SQLERRP    = DSNXOGB SQL PROCEDURE DETECTING ERROR                     
DSNT416I SQLERRD    = -200  0  0  -1  0  0 SQL DIAGNOSTIC INFORMATION           
DSNT416I SQLERRD    = X'FFFFFF38'  X'00000000'  X'00000000'  X'FFFFFFFF'       
         X'00000000'  X'00000000' SQL DIAGNOSTIC INFORMATION


I have cross-checked the table name and column name, they are exactly the same.
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Rohit Umarjikar

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Joined: 21 Sep 2010
Posts: 2038
Location: NY,USA

PostPosted: Fri Mar 09, 2018 10:16 pm    Post subject:
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Try if this approach works.

Code:
select tablea.* from table a
where a.role_code in ('OWN','PAY')
and master_id in (
(select b.MASTER_ID
from table b
where b.role_code in ('OWN','PAY')
group by b.MASTER_ID
having count(DISTINCT(b.DIRECTORY_ID)) = 2 ))
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RahulG31

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Joined: 20 Dec 2014
Posts: 444
Location: USA

PostPosted: Fri Mar 09, 2018 10:53 pm    Post subject: Reply to: Query to compare 2 values of 1 column based on where clause
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I would do it this way:
Code:
SELECT A.MASTER_ID FROM ROLES A
 WHERE A.ROLE_CD = 'OWN'
    AND NOT EXISTS ( SELECT '1'
                     FROM ROLES B
                WHERE B.MASTER_ID = A.MASTER_ID
                   AND B.ROLE_CD = 'PAY'
                   AND B.DIRECTORY_ID = A.DIRECTORY_ID )
          WITH UR;
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Arun Raj

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PostPosted: Fri Mar 09, 2018 11:36 pm    Post subject: Reply to: Query to compare 2 values of 1 column based on where clause
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Rahul,

The OP wants both the rows, so might need slight tweaking.
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RahulG31

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PostPosted: Sat Mar 10, 2018 12:43 am    Post subject: Reply to: Query to compare 2 values of 1 column based on where clause
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I thought the OP only wanted the MASTER_ID and the data shown was for representation of those rows containing that one MASTER_ID.
Quote:
I want to fetch those MASTER_ID which is not having the same DIRECTORY_ID in ROLE_CODE 'OWN' & 'PAY'.

Anyways, OP must have got the idea on how to do it.

.
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Arun Raj

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PostPosted: Sat Mar 10, 2018 1:06 am    Post subject:
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I was looking at the OP's 'Expected output' in code tags.
Quote:
Anyways, OP must have got the idea on how to do it.
Agree.
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Rohit Umarjikar

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PostPosted: Sat Mar 10, 2018 1:42 am    Post subject:
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RahulG31, Nice shot! Another outer Select on your query should give OP two rows if required.
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Arun Raj

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PostPosted: Sat Mar 10, 2018 2:35 am    Post subject:
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Rohit Umarjikar wrote:
Another outer Select on your query should give OP two rows if required.
May be not...
Code:
SELECT *                 
  FROM ROLES A                     
 WHERE A.ROLE_CD IN ('OWN','PAY')                   
   AND EXISTS (SELECT '1'                         
                 FROM ROLES B   
                WHERE B.MASTER_ID     = A.MASTER_ID   
                  AND B.ROLE_CD       IN ('OWN','PAY')
                  AND B.DIRECTORY_ID  <> A.DIRECTORY_ID)   
WITH UR;   
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Poha Eater

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Joined: 31 Aug 2016
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PostPosted: Mon Mar 12, 2018 3:09 pm    Post subject:
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Thank you all for your replies. Thanks a lot. I am going to try these and let you know the results. Sorry for the late reply, for some reason i was not able to access internet from last 2 days.
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Poha Eater

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PostPosted: Wed Mar 14, 2018 7:13 am    Post subject:
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Hi Rohit,

I tried your query and it worked and gave expected results. Thanks a lot for helping me out.

This is the query which i ran :
Code:

SELECT A.MASTER_ID,A.DIRECTORY_ID,A.ROLE_CODE FROM ROLES A 
WHERE A.ROLE_CODE IN ('OWN','PAY')                                   
AND MASTER_ID IN (                                                   
(SELECT B.MASTER_ID                                                 
FROM ROLES B                                               
WHERE B.ROLE_CODE IN ('OWN','PAY')                                   
GROUP BY B.MASTER_ID                                                 
HAVING COUNT(DISTINCT(B.DIRECTORY_ID)) = 2 ))                       


Further, i was trying to use the DIRECTORY_ID from the result of this query to fetch the data from the row which exists in another table, i.e. (NMADX). This NMADX table has a NAME field for every DIRECTORY_ID.

I was trying to use the above query in sub-query using WHERE DIRECTORY_ID IN clause but the query is not completing successfully and giving error. Can you please suggest how can i handle this situation.


Thanks !
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Arun Raj

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PostPosted: Wed Mar 14, 2018 7:29 pm    Post subject:
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Quote:
the query is not completing successfully and giving error
Can you post the exact error message?
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Rohit Umarjikar

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Joined: 21 Sep 2010
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PostPosted: Thu Mar 15, 2018 12:08 am    Post subject:
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Quote:
I was trying to use the above query in sub-query using WHERE DIRECTORY_ID IN clause but the query is not completing successfully and giving error. Can you please suggest how can i handle this situation.

You will get error because in above SELECT query (which is working) there are other columns apart from DIRECTOR_ID. if you just need DIRECTOR_ID look up then remove rest all columns from SELECT and use it in IN , that should work.
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Poha Eater

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PostPosted: Sat Mar 17, 2018 9:11 am    Post subject:
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Hi Arun,
As Rohit has mentioned, i was using multiple columns in SELECT statement of my sub-query and that is why it was resulting in error.


Hi Rohit,
When i changed the sub-query from multiple columns in SELECT to only DIRECTORY_ID column it worked fine and i received the expected results. Thanks again for pointing me in right direction icon_smile.gif


Thanks Rahul for your responses. Appreciate that !


Below is the query which i used :

Code:
SELECT DIRECTORY_ID,NAME FROM NMADX WHERE   
DIRECTORY_ID IN                                       
 (SELECT A.DIRECTORY_ID FROM ROLES A         
  WHERE A.ROLE_CODE IN ('OWN','PAY')                 
  AND MASTER_ID IN                                   
   (SELECT B.MASTER_ID                               
    FROM ROLES B                             
    WHERE B.ROLE_CODE IN ('OWN','PAY')               
    GROUP BY B.MASTER_ID                             
    HAVING COUNT(DISTINCT(B.DIRECTORY_ID)) = 2 ))     
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