Re: How do I extract ONE particular field, when multiple table contain

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От Arne Weiner
Тема Re: How do I extract ONE particular field, when multiple table contain
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Msg-id 3B9F5AFF.AD76E2A6@gmx.de
обсуждение исходный текст
Список pgsql-sql
If you refere to more than one table in a query, you have to specify 
which column to which table belongs. So your query must be

Select XID, xi.DENOM, PRICE, FRT, CTID From XItem xi, Category c Where
xi.System=1 and xi.Category=c.Index


Arne.

Olle Wijk wrote:
> 
> Hi,
> 
> I am pretty new att using SQL-quires, could anyone help me with this
> one:
> 
> I want to do the following SQL-query:
> 
> Select XID, DENOM, PRICE, FRT, CTID From XItem xi, Category c Where
> xi.System=1 and xi.Category=c.Index
> 
> the problem is that the field 'DENOM' is present in both table 'XItem'
> and
> 'Category' (it is a text description field where you explain whatever
> you
> want). Therefore I get the following complaint when I run the query:
> 
> Error msg: "The specified fiel 'DENOM' could refer to more than one
> table listed
> in the FROM clause of your SQL-statement"
> 
> The DENOM-field I actually want is the one belonging to the
> XItem-table.
> I would most appreciate if someone could give me a hint how to alter
> the
> SELECT-statement above so that it does what I want.
> 
> Regards
> 
> /olw


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