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AW: Select one valuebut not the other




Simply translated:

select *  from table t1
where t1.data_value=1 
AND not exists(select * from table t2 
               where t2.data_value=2
               and   t2.item_number = t1.item_number)



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-----Ursprüngliche Nachricht-----
Von: Olivier Nicole [mailto:Olivier.Nicole@xxxxxxxxxxxx] 
Gesendet: Mittwoch, 29. April 2015 07:21
An: mogens@xxxxxxxxxxxxx
Cc: mysql@xxxxxxxxxxxxxxx
Betreff: Re: Select one valuebut not the other

> SELECT * FROM table WHERE item_number=1;

Sorry if my question was not clear: what I am looking for is:

SELECT * FROM table WHERE data_value=1 AND "there is not any reccord with
the same item_number and data_value=2"

Olivier

>
> On Wed, April 29, 2015 06:30, Olivier Nicole wrote:
>> Hi,
>>
>> I am sure that it is feasible with MySQl, and I am sure that's a 
>> newbie question, but my SQL skills are limited...
>>
>> I have a table where each record is made of one item_number and one 
>> data_value.
>>
>> If one item has several values, there are several records with the 
>> same item_number and a different data_value.
>>
>> What is the command to select all the records where an item_number 
>> has the data 1 but not the data 2?
>>
>> Thanks in advance,
>>
>> Olivier
>
> --
> Mogens Melander
> +66 8701 33224
>
>
> --
> This message has been scanned for viruses and dangerous content by 
> MailScanner, and is believed to be clean.

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