Jason Dodson a écrit :

> Alter Table Table2
> Add MyNewField Computed By ((Select (Table2.Date2 - Table1.Date1) as MyNewField From Table1 Inner Join Table2 on
> Table1.ID_Table1 = Table2.ID_Table2));
>
> Klett wrote:
>
>> Hello,
>> It's my first message on this forum. I apologize for my bad English.
>> Here is my problem.
>> I 've 2 tables
>>
>> TABLE_1
>> ID_Table1 INTEGER NOT NULL,
>> ....
>> Date1 DATE,
>> .....
>>
>> ALTER TABLE Table_1 ADD CONSTRAINT PK_TABLE_1 PRIMARY KEY (ID_Table1);
>>
>> TABLE 2
>> ID_Table2 INTEGER NOT NULL,
>> ID_Table1 INTEGER,
>> .....
>> Date2 DATE,
>> ....
>> ALTER TABLE Table_2 ADD CONSTRAINT PK_Table_2 PRIMARY KEY (ID_Table2);
>> ALTER TABLE Table_2 ADD CONSTRAINT FK_Table_2 FOREIGN KEY (ID_Table1)
>> REFERENCES Table1 (ID_Table1);
>>
>>
>> I would have a COMPUTED BY Field on the Table 2
>> "Date2" - "Date1"
>>
>> Is it possible ?
>> Thanks for any hep
>>
>>
>>
>>
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>>
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>>
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>>
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>
>
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>
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>
> Visit http://firebird.sourceforge.net and click the Resources item
> on the main (top) menu. Try Knowledgebase and FAQ links !
>
> Also search the knowledgebases at http://www.ibphoenix.com
>
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>

Jason

Thanks for your help
I succeeded in doing the Computed by Field.
Klett