How to join 3 tables

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Hello every member,

I have three tables. Items in each table as follow:

1-product (id, productcode, name, packagesize, balance, groupid)<br />
2-productgroup (groupid, groupname)<br />
3-purchaseorder ( id, ponumber, productcode, podate, outstandingbalance, balanceorder)

I have Join two table (product and purchaseorder by sum column(outstandingbalance) which item that duplicated as code below:

DIM da AS NEW OLEDB.OLEDBDATAADAPTER("SELECT P.productid, P.fullcode, P.productname, P.packagesize, P.pcsperctn , sum(PO.outstandingbalance) AS [PurchaseOutstanding], P.balanceinstock, P.supplier from product P left outer join purchaseorder PO on P.fullcode=PO.productcode group by P.productid, P.fullcode, PO.productcode, P.productname, P.packagesize, P.pcsperctn,P.balanceinstock, P.supplier", cn)

but I try to join three together ( 3 table) as below:

DIM da AS NEW OLEDB.OLEDBDATAADAPTER("SELECT P.productid, P.fullcode, P.productname , P.packagesize, P.pcsperctn , sum(PO.outstandingbalance) AS [purchase], P.balanceinstock, P.supplier, G.groupname from productgroup G, product P left outer join purchaseorder PO on P.fullcode=PO.productcode where P.groupid=G.groupid group by P.productid, P.fullcode, PO.productcode,P.productname,P.packagesize, P.pcsperctn,P.balanceinstock, P.supplier, G.productname", cn)

and then I have run the application so I get error like this " Join expression not supported. "

Thank & Regards

VISAL

Posted 12-Jul-11 23:12pm

kimvisal

Updated 12-Jul-11 23:22pm

Toniyo Jackson

v3

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Reiss 13-Jul-11 5:19am

This is a sql question and not a VB.NET one (The error is being thrown by the database) - you might have more success if you re-tag it.

3 solutions

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Prerak Patel · Answer 1 · 2011-07-12T23:45:00

Solution 1

from productgroup G, product P left outer join purchaseorder PO on P.fullcode=PO.productcode

You have not joined productgroup.

Refer to http://msdn.microsoft.com/en-us/library/aa213227(v=sql.80).aspx[^]

Posted 12-Jul-11 23:45pm

Prerak Patel

Comments

[no name] 14-Jul-11 2:50am

good

S Douglas · Answer 2 · 2011-07-13T08:45:00

As Prerak indicated the problem is in the join.

SQL

SELECT
    P.productid,
    P.fullcode,
    P.productname ,
    P.packagesize,
    P.pcsperctn ,
    sum(PO.outstandingbalance) AS [purchase],
    P.balanceinstock,
    P.supplier,
    G.groupname
FROM
    product P
    INNER JOIN productgroup G ON (P.groupid=G.groupid )
    LEFT OUTER JOIN purchaseorder PO ON (P.fullcode=PO.productcode)
GROUP BY
    P.productid,
    P.fullcode,
    PO.productcode,
    P.productname,
    P.packagesize,
    P.pcsperctn,
    P.balanceinstock,
    P.supplier,
    G.productname

RaviRanjanKr · Answer 3 · 2011-07-13T10:18:00

Solution 3

Try
Joining Three or More Tables[^]

Posted 13-Jul-11 10:18am

RaviRanjanKr