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17/11/2009 11:54:51
 
 
Information générale
Forum:
ASP.NET
Catégorie:
Formulaires
Titre:
Re: SQL
Versions des environnements
Environment:
C# 3.0
Database:
MS SQL Server
Divers
Thread ID:
01435087
Message ID:
01435222
Vues:
45
>>Hi All,
>>
>>I have 5 tables all with the same fields, one of which is the date. I want to write a query that will return a single row for each date that contains the values of all the other fields in each table. I have tried using the distinct key word in my select statement, but it only seem to work on a single column.
>>
>>What I get is multiple rows for each date, with some columns having a null value.
>>
>>Does anyone have any ides how to accomplish the seeming simple task?
>>
>>Thanks,
>>
>>Jim
>
>
>select distinct from (select T1.Fields from Table1 T1 UNION ALL Select T2.Fields from Table2 T2 etc.) X
>
>Or please explan in more details what exactly do you want.

Thanks Naomi,

Her is the statement written as you suggest.

SELECT DISTINCT FROM(select Well_5.DailyRuntime, Well_5.DailyStarts, Well_5.DailyFlowrate from Well_5 union all
select Well_6.DailyRuntime, Well_6.DailyStarts, Well_6.DailyFlowrate from Well_6)

this returns an error 'Incorrect syntax near the keyword FROM'

I have three additional tables representing other wells that have the same columns and also need to be included in this query. I also need to retrieve one of the date columns from any of the tables since they all have data for the requested date.

Thanks again for your help,

Jim
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