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SQL Query

 
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coolman
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Joined: 03 Jan 2003
Posts: 283
Topics: 27
Location: US
PostPosted: Thu May 06, 2004 9:31 am    Post subject: SQL Query Reply with quote
Hello,

I have 2 tables. Table X and Y.

Table X structure is as below with just 1 column.

Code:

Region_Code
========
1
2
3
4
5

Table Y structure is as below with 2 columns
Code:

State Code     Region_Code
=======        =========
A                 1
A                 2
A                 3
A                 5
B                 1
B                 5

Now, I want the output with the state codes and the missing region codes.

Expected Result
===========
Code:

State Code     Region_Code
=======        =========
A                 4
B                 2
B                 3
B                 4

Is there a way to accomplish this using a query?

Cheers,
Coolman.
________
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Last edited by coolman on Sat Feb 05, 2011 1:36 am; edited 1 time in total
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bauer
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Joined: 10 Oct 2003
Posts: 315
Topics: 49
Location: Germany
PostPosted: Thu May 06, 2004 10:52 am    Post subject: Reply with quote
Hi,

in table Y: you meen StaeCode = A,B,C, ........
Region code = 1,2,3,4,5

Your exampleo looks like StateCode = A1, A2,..... and Region Code = Empty ?
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coolman
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Joined: 03 Jan 2003
Posts: 283
Topics: 27
Location: US
PostPosted: Thu May 06, 2004 11:49 am    Post subject: Reply with quote
Bauer,
You are right. The state code is just A,B,C ....and Region Code=1,2,3,4...

I'm not sure I was not able to edit my post. Moderator, can you please help me out.

Cheers,
Coolman.
________
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Last edited by coolman on Sat Feb 05, 2011 1:36 am; edited 1 time in total
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Himesh
CICS Forum Moderator
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Joined: 20 Dec 2002
Posts: 80
Topics: 21
Location: Chicago
PostPosted: Thu May 06, 2004 12:13 pm    Post subject: Reply with quote
Coolman,

If you want to select all the statecodes that do not have a corresponding region code in tablex, the following SQL should suffice:

Pls note: You need to provide more details while posting a topic. I have assumed that you are using DB2.

Basically, what the SQL query does is:

Create a superset of a combination of all Statecodes and distinct RegionCodes and search for this combination in a new resultant table formed by joining the two tables. All the records that do not match are the ones you are looking for.


Code:

SELECT substr(P.totalstring,2,1) statecode, substr(P.totalstring,1,1) regioncode
FROM
   (SELECT W.regioncode||E.statecode totalstring
   FROM
      (select regioncode from
           tablex ) W ,
      (select distinct statecode
           from tabley) E
   WHERE
   W.regioncode||E.statecode NOT IN
      (select R.regioncode||R.statecode
             from tabley R, tablex T
       where R.regioncode = T.regioncode)
   ) P
;


regards,
himesh
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kolusu
Site Admin
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Joined: 26 Nov 2002
Posts: 12376
Topics: 75
Location: San Jose
PostPosted: Thu May 06, 2004 12:30 pm    Post subject: Reply with quote
Coolman,

A good query to test your sql skills. The following sql will give you desired results.

Code:

SELECT DISTINCT A.STATE_CODE,B.REGION_CODE                                   
 FROM TABLE_Y A                                                   
    ,TABLE_X B                                                   
 WHERE (A.STATE_CODE,B.REGION_CODE) NOT IN (SELECT STATE_CODE
                                                 ,REGION_CODE
                                              FROM TABLE_Y)
;


Hope this helps...

Cheers

Kolusu
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coolman
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Joined: 03 Jan 2003
Posts: 283
Topics: 27
Location: US
PostPosted: Thu May 06, 2004 3:28 pm    Post subject: Reply with quote
Thanks Himesh and Kolusu for your help.
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Last edited by coolman on Sat Feb 05, 2011 1:36 am; edited 1 time in total
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Himesh
CICS Forum Moderator
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Joined: 20 Dec 2002
Posts: 80
Topics: 21
Location: Chicago
PostPosted: Fri May 07, 2004 12:38 am    Post subject: Reply with quote
As Kolusu said, it is indeed a nice query (sort of an un-orthodox case, if i may say so).

Kolusu's solution is the ideal one. It shows that you need to have a good understanding of how DB2 would interpret SQL statements.

I had gone the roundabout way. (Maybe my long hours is taking its toll now Embarassed ).


regards,
himesh
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