How to select multiple mysql column having more than 1 of same entry.

Hi,

I would like to request an assistant.

Let say i have the following tables :

Table Name : tblhostingconfigoptions

relid         |   configid  
------------- |   ------------
  1           |    AA  
  1           |    AA  
  2           |    C  
  3           |    DDD  
  3           |    DDD  
  3           |    DDD  
  4           |    F  
  4           |    G  
  4           |    H  
  4           |    I
 

May i know how to select only data that have more than 1 for relid having the same configid

Eg:

1. relid 1 having 2 AA configid.
2. relid 3 having 3 DDD configid
LVL 2
Shamsul KamalJunior TechAsked:
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Marco GasiFreelancerCommented:
Use this:
SELECT * FROM tblhostingconfigoptions WHERE relid='1' AND configid='AA'

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Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
if you mean to return all the duplicate records, you can try:
select a.* from tblhostingconfigoptions a
inner join
(select relid, configid
 from tblhostingconfigoptions
group by relid, configid
having  count(configid) > 1
) b
on a.relid = b.relid and b.configid = b.configid
order by a.relid, a.configid

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use this to get a summary for you:
select relid, configid, count(configid) cnt
 from tblhostingconfigoptions
group by relid, configid
order by relid, configid

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Vikas GargAssociate Principal EngineerCommented:
Hi,

You can try this query

SELECT RELDI,configid FROM
(
SELECT RELDI,configid,(SELECT COUNT(configid) FROM tblhostingconfigoptions B WHERE B.RELDI = A.RELID) CT FROM tblhostingconfigoptions A
) TBL
WHERE CT > 1

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Julian HansenCommented:
This is very easy to do with the HAVING  statement

SELECT COUNT(*), relid, configid FROM tblhostingconfigoptions 
GROUP BY relid, configid
HAVING COUNT(*) > 1

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The statement groups all relid / configid combinations together and creates a COUNT for them - it then limits the returned values to only those that have more than 1 for COUNT
Julian HansenCommented:
To see the HAVING solution in action you can look at this working sample here
Shamsul KamalJunior TechAuthor Commented:
Hi,

Thanks guys !

I use the following combination and get the results that i want :

select relid, configid, count(configid) cnt
 from tblhostingconfigoptions
group by relid, configid  HAVING COUNT(*) > 1
order by relid, configid
Julian HansenCommented:
@smksa,

The solution you are using does  not match the post you chose as the accepted solution
Shamsul KamalJunior TechAuthor Commented:
Is it ? as i choose :

select relid, configid, count(configid) cnt
 from tblhostingconfigoptions
group by relid, configid
order by relid, configid

From Ryan Chong .

And i edit the query by adding "HAVING COUNT(*) > 1" taken from your suggestion.


Please let me know if i chose wrong and wrong in distributing points.
Julian HansenCommented:
Please let me know if i chose wrong and wrong in distributing points.
Nope - points was fine - did not see second section of Ryan's post. 100% correct.
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