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Proper syntax for creating sub-queries
Message
De
26/07/2008 16:10:22
 
 
À
26/07/2008 15:59:35
Raza Malik
Universal Accounting Software
Edgewater, New Jersey, États-Unis
Information générale
Forum:
Visual FoxPro
Catégorie:
Codage, syntaxe et commandes
Versions des environnements
Visual FoxPro:
VFP 9 SP2
Divers
Thread ID:
01334260
Message ID:
01334264
Vues:
15
This message has been marked as the solution to the initial question of the thread.
>I just upgraded to VFP 9.0, where the syntax for the GROUP BY clause has changed and requires to list all the fields. I am new to su-queries.
> I want to select multiple fields from a table but SUM & GROUP BY by field (itm_nuymb) only. Can someone give me a proper syntax to accomplish that. Listed below is a sample code which I think need a sub-query and I am new to that.
>
>
>             SELECT itm_numb, itm_desc, sls_code, tax_code, SUM(unt_qtty) AS nQty ;
>    	FROM table1  GROUP BY itm_numb ORDER BY itm_numb
>
Yes, a sub query will help you in that direction. The syntax is about like this:
SELECT Table1.itm_numb,Table1.itm_desc,Table1.sls_code,Table1.tax_code,Temp.nQty;
 FROM (SELECT MAX(Table1.itm_numb) AS PrimaryKey,SUM(Table1.unt_qtty) AS nQty FROM Table1 GROUP BY itm_numb) AS Temp;
 INNER JOIN Table1 ON Temp.itm_numb=Table1.itm_numb;
 ORDER BY Table1.itm_numb
I tested a syntax like that locally with my tables. This is usually how I do it. So, this should give you an idea on how to do it. There are various ways to achieve this. This is only one approach. I am sure you will get other replies with more ideas.
Michel Fournier
Level Extreme Inc.
Designer, architect, owner of the Level Extreme Platform
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