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Specific SQL query

Author

Topic

stenhoeve
Starting Member

5 Posts

Posted - 2014-05-13 : 04:30:12

Hello, I have the following question. I have a table with a column that contains registrationnumbers and a column that contains mutation codes. The registrationnumber can be duplicate but can't have the same mutationcode.

So registrationnumber 1234 with mutationcode 01 and/or 1234 with 02

What I would like to achieve is to get a list of all registrationnumbers that don't have a specific combination e.g. 1234 with 099 in the database.

khtan
In (Som, Ni, Yak)

17689 Posts

Posted - 2014-05-13 : 05:46:50

[code]
select *
from yourtable
where registrationnumber <> '1234'
and mutationcode <> '099'
[/code]

KH
[spoiler]Time is always against us[/spoiler]

stenhoeve
Starting Member

5 Posts

Posted - 2014-05-13 : 06:02:51

Thank you for your reaction but I think this statement is not exactly what I am trying to acchieve.
This statement wil give me all records without this specific combination.
What I mean is that I would like to have all registrationnumbers in combination with mutationcode 01 and/or 02 but this list of registrationnumebers do not have a combination with code 099

Ifor
Aged Yak Warrior

700 Posts

Posted - 2014-05-13 : 07:40:43

You will get better answers if you provide test data and the expected results for the test data.
Something like the following should work but, without test data, the details are up to you.


SELECT DISTINCT RegistrationNumber
FROM YourTable T1
WHERE NOT EXISTS
(
	SELECT 1
	FROM YourTable T2
	WHERE T2.RegistrationNumber = T1.RegistrationNumber
		AND T2.MutationCode = '099'
);

stenhoeve
Starting Member

5 Posts

Posted - 2014-05-13 : 08:24:31

Thank you

ScottPletcher
Aged Yak Warrior

550 Posts

Posted - 2014-05-13 : 12:46:00

You can check for specific mutation values that must all match or not match like below. If you need to see all columns from the row, add:
select * from yourtable where registrationnumber in (
before the query below and
)
after it.



select  registrationnumber
from    yourtable
group by registrationnumber
having  SUM(case when mutationcode = '001' then 1 else 0 end) = 1 and --match
        SUM(case when mutationcode = '002' then 1 else 0 end) = 1 and --match
        SUM(case when mutationcode = '099' then 1 else 0 end) = 0 --no match

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