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Get PK Value for unique field value
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De
24/09/2004 15:03:12
 
 
À
24/09/2004 14:57:09
Information générale
Forum:
Microsoft SQL Server
Catégorie:
Syntaxe SQL
Divers
Thread ID:
00945785
Message ID:
00945842
Vues:
18
Did you try it? As far as I understand, 'Group By' in SQL works just as it does in VFP8 in that you must include all fields from the select only if they are not aggregate fields.

Alan

>Group Bys don't work in SQL like they do in VFP. You have to list every field in the SELECT list in the Group By clause.
>
>I have a solution that uses correlated subqueries that is working very well.
>
>Thanks for you time anyway.
>
>>That's different story.
SELECT MIN(PK) AS PK, Value
>>  FROM mytable
>>  GROUP BY value
>>-- OR
>>SELECT MAX(PK) AS PK, Value
>>  FROM mytable
>>  GROUP BY value
>>
>>
>>>I really don't care if it is the first or last. I really only want one.
>>>
>>>>Hi Dan,
>>>>
>>>>You have to define the meaning of "the first PK value" in terms of data in the table. IOW, which field defines the PK order and how.
>>>>
>>>>>I have a table that is using UNIQUEIDENTIFIER pk values. There is another character field that has duplicate values in it.
>>>>>
>>>>>For example (using integer pks for simplicity)
>>>>>
>>>>>
>>>>>PK   Value
>>>>>1    a
>>>>>2    b
>>>>>3    a
>>>>>4    c
>>>>>5    a
>>>>>
>>>>>
>>>>>I want a query that will give me the first PK value for each unique "Value". So I will get back:
>>>>>
>>>>>
>>>>>PK
>>>>>1
>>>>>2
>>>>>4
>>>>>
>>>>>
>>>>>How can I do this?
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